Barcelona keeps its trees on two lists. The municipal Catalogue of Trees of Local Interest holds more than 200 specimens, but the Catalan government's rarer monumental designation belongs to only four trees in the whole city, all four growing in the same shaded ravine of the old botanical garden on Montjuic. Barcelona's oldest tree predates the city's own street grid: a 250-year-old holm oak now standing in a garden its neighbours spent three years fighting to save. Two more grew up inside Gaudi's Park Guell before he built around them. None of them need a ticket.
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1
The Holm Oak of Carrer de l'Encarnacio
Holm Oak (Quercus ilex) · about 250 years · Vila de Gracia
Barcelona's oldest tree nearly lost to a housing development. This holm oak already stood on the rural Pla del Bonpa, tied to a farmhouse called Can Vidalet, when Gracia was still open countryside rather than a neighbourhood. It shows up on the city's own maps from 1845, and dendrochronologists, who read a tree's age in its rings, later put its age at around 250 years. By the 2010s the oak stood in the courtyard of the Casetes de l'Encarnacio, a cluster of small 19th century houses slated for demolition to build new flats. Neighbours spent three years fighting the plan under the banner Salvem l'Alzina, Save the Oak, and in 2019 the city catalogued the tree as a Tree of Local Interest specifically to stop the diggers. It worked, partly: the houses could not be fully restored, only their facades survived, but the garden around the oak opened to the public in April 2021. The tree is now 22 metres tall with a canopy the same width, wider than any other oak measured in the city.
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2
The Carob of the Viaduct
Carob (Ceratonia siliqua) · about 130 years · Park Guell, Gracia
Gaudi built stone columns shaped like tree trunks all through Park Guell, and left this real one standing in the middle of them. The carob was already rooted on the hillside, born around 1893, when Eusebi Guell hired Gaudi to turn the estate into a garden city in 1900. Rather than clear it for the viaduct he was designing, Gaudi ran the structure's sloped stone columns around the living trunk, so a real tree grows inside a colonnade built to look like a forest of them. A 1904 photograph by the Barcelona photographer Josep Maria Armengol shows the arrangement barely a year after construction finished, the young carob still slender among the new stonework. Carob trees are Mediterranean natives that shrug off drought and poor soil, exactly the terrain Guell's estate offered before Gaudi arrived. More than a century later the tree has thickened into the columns around it, an unplanned collaboration between a 19th century Catalan Modernist and a species that was growing on that slope long before he was born.
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Photo : Ingimar (CC BY-SA)
3
The Regrown Carob of Placa de la Natura
Carob (Ceratonia siliqua) · about 120 years (current stem); the original tree it grew from is undated · Park Guell, Gracia
This tree is technically a stump's second act. A carob once stood on this spot in Park Guell with a trunk more than four metres around, large enough to rank among the biggest of its species anywhere in the park. At some point it died back or was cut, and rather than disappear, it sent up a new shoot from the base, the way carobs and many Mediterranean trees regenerate after fire or damage. That shoot, catalogued as having sprouted around 1907, is the tree standing today: a modest 90 centimetres around, ringed by the twisted, weathered remains of the giant it replaced. The effect looks almost deliberately designed, a young trunk framed by the sculptural wreckage of its parent, in a park where Gaudi's actual stonework does the same thing on purpose elsewhere. Nobody plans a regrowth like this. The old carob's dead wood simply happened to curve the way Gaudi's stone columns do a few hundred metres away, which is either coincidence or proof that this particular hillside only knows how to grow one way.
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4
The Himalayan Cedar of the Labyrinth
Himalayan Cedar (Cedrus deodara) · about 115 years · Horta-Guinardo
This cedar grows in the oldest surviving garden of its kind in Barcelona, a neoclassical estate commissioned in 1791 that later grew a romantic wing around it, cypress maze included. The Himalayan cedar itself is a relative latecomer to that story, planted around 1910 in what the estate calls its domestic garden, alongside a silver lime it still shares the plot with today. Himalayan cedars come from the mountains between Afghanistan and Nepal, where the wood was prized for shipbuilding and temple construction; this one has spent over a century adapting to Mediterranean summers instead. A storm at some point in its life snapped its main growth leader, the topmost shoot that normally directs a conifer's upward climb, and the tree has grown on with a slightly altered silhouette ever since, its crown now 22 metres across. The whole park closed in March 2025 for a two-year renovation of its historic cypress maze and irrigation system, so this cedar stands out of reach until the gardens are due to reopen in 2027.
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Photo : Pere López (Pere prlpz) (CC BY-SA 3.0)
5
The Wingnut of the Sot de l'Estany
Rehder's Wingnut (Pterocarya x rehderiana) · about 100 years · Montjuic, Sants-Montjuic
Barcelona's biggest tree grows in a hole nobody visits. The Sot de l'Estany is a former quarry pit inside the city's historic botanical garden, deep enough and damp enough to work like a greenhouse, and this wingnut has used that shelter to reach roughly 40 metres, a height the city's own catalogue admits it struggled to measure with standard equipment because the surrounding walls block a laser sightline. The tree is a Rehder's wingnut, a deliberate hybrid between a Caucasian and a Chinese species first crossed in 1908 by Alfred Rehder, a horticulturist at Boston's Arnold Arboretum, which makes this specimen barely a decade or two younger than the hybrid itself. It is the only tree of its kind recorded in Barcelona, and likely for a considerable distance beyond it. In April 2025 the Catalan government named it one of only four monumental trees in the entire city, all four sharing this same ravine. Visitors to the botanical garden rarely find their way down into the Sot; the tree that beats every other in Barcelona for size stands in the one corner of the garden most people walk straight past.
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Photo : DagafeSQV (CC BY-SA 3.0)
6
The Green Ash of the Sot de l'Estany
Green Ash (Fraxinus pennsylvanica) · about 100 years · Montjuic, Sants-Montjuic
This ash comes from the flooded river bottoms of eastern North America, a species built to have its roots underwater for weeks at a time, and it is rare enough in Barcelona that the city's own tree catalogue calls it out by name. Planted in 1924 in the same sheltered ravine, the Sot de l'Estany, that shelters the botanical garden's giant wingnut, it has grown past 24 metres tall on the humidity the old quarry pit traps at the bottom of Montjuic. Green ash rarely gets planted as an ornamental tree in Mediterranean Europe, where its native swampy habitat has no local equivalent, which is part of why the Catalan government granted it monumental status alongside three neighbours in April 2025: not the biggest tree in the garden, but among the least expected. Botanists visiting the garden's deepest corner can, in a few square metres, find a Chinese-Caucasian hybrid, an American swamp tree, a native Iberian ash and a European maple relative growing side by side, an unplanned arboretum inside an arboretum.
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Photo : Josep Trepat Font (CC BY-SA 2.0)
7
The Magnolia of the Maternity Gardens
Southern Magnolia (Magnolia grandiflora) · 100+ years · Les Corts
This magnolia is probably the biggest of its kind in Barcelona, and it grows in a garden built for a maternity hospital that no longer delivers babies. The Jardins de la Maternitat sit on the old Can Cavaller estate, developed from 1889 into a Modernista hospital complex by the architect Camil Oliveres, and the grounds kept their original planting long after the wards changed use. The magnolia itself has no recorded planting date, only a description in the city's own tree records as centenaria, over a hundred years old, which places its origin somewhere in the hospital's early decades. It has since spread past 12 metres tall and over 15 metres wide, a canopy wide enough to shade a small plaza on its own, among roughly forty tree species catalogued across the gardens. Southern magnolias flower in early summer with blooms that can reach 30 centimetres across, a single-species argument for why a hospital garden was worth keeping intact once the hospital itself moved on.
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8
The Silk Tree of the Ciutadella
Silk Tree (Albizia julibrissin) · 130 years · Ciutat Vella
A silk tree in a temperate climate is not built to last much past forty. Barcelona's specimen in Parc de la Ciutadella has been flowering every July since around 1896, well over a century past its species' usual expiry date. Albizia julibrissin earns its keep fast: fern-like leaves that fold shut like a hand closing at dusk, and pink, thread-like blooms shaped like a powder puff, built for a few decades of showing off before the tree gives out. This one never got that memo. Repeated infections have hollowed out its central trunk over the decades, a fact the city's own tree register states plainly rather than hides, and the crown above keeps flowering regardless every summer. It went into the ground around the years Barcelona's Natural Sciences Society ran its collections out of the museums nearby, when the park doubled as an open-air showcase for botanical curiosities brought back from around the world. About 1,100 of the same species now grow across Barcelona's streets and gardens, mostly planted as short-lived ornamentals expected to be swapped out within a generation. The Ciutadella specimen, catalogued as a Tree of Local Interest in 1996, has spent thirty years since making that paperwork look premature.
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9
The Ombu of Placa Prim
Ombu (Phytolacca dioica) · about 100 years · Poblenou, Sant Marti
This tree looks like it is made of muscle rather than wood, which is close to the truth. The ombu is native to the Pampas grasslands of Argentina, Uruguay and southern Brazil, and its trunk grows soft and fibrous rather than hard, swelling into rippled, root-like folds that store water through dry seasons its South American homeland is prone to. Planted in Placa Prim around 1924, one of three ombus that give this small Poblenou square its character, it has reached 9.5 metres tall with a trunk two and a half metres around at chest height and a crown spreading seven and a half metres wide, all without producing wood dense enough to be useful as timber, which is why ombus rarely get planted for anything but shade and spectacle. The species arrived in Spain as an ornamental import in the early 20th century, popular for exactly this reason: nothing else in a European city square looks quite like it. Poblenou was still an industrial district of textile mills when this one went into the ground; the mills are mostly lofts and tech offices now, and the ombu has outlasted the neighbourhood's whole first identity.
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Photo : Pere Lopez Brosa (Pere prlpz) (CC BY-SA 3.0)
10
The Palms of Casa de la Misericordia
California Fan Palm (Washingtonia filifera) · about 120 years · El Raval, Ciutat Vella
Four palm trees have stood in the courtyard of a former orphanage for over a century, planted around 1904 when the building still ran as the Casa de la Misericordia, a charitable institution founded in 1583 that raised abandoned girls into the 20th century. California fan palms are native to desert oases in the American Southwest and northern Mexico, an odd match on paper for a Gothic Revival courtyard in the Raval, but the species tolerates poor soil and long dry spells well enough to have become a fixture of Mediterranean city planting. For decades the courtyard itself was closed to the public, part of an institutional building tucked behind Carrer Elisabets that most of the Raval walked past without ever seeing inside. That changed recently when a cafe opened in the garden, putting four palms that had grown for a century behind closed doors back in view of anyone who orders a coffee. The building continues to house a school; the palms, remarkably, have outlasted several changes of institutional purpose above their heads.
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Photo : Herodotptlomeu (CC BY-SA 3.0)
11
The Casuarina of the Cascada
River She-oak (Casuarina cunninghamiana) · about 130 years · Sant Pere, Santa Caterina i la Ribera, Ciutat Vella
Everything about this tree says pine, and none of it is true. What look like drooping grey-green needles are jointed green twigs doing the work of leaves, and the real leaves are microscopic scales in rings at each joint, visible only if you pull a strand apart. Its relatives are the oaks and the birches, with not a single conifer among them. The river she-oak went into the ground beside the Cascada around 1894, six years after the Universal Exposition turned a demolished fortress into Barcelona's first public park, and it has thickened into two trunks fused at the base that separate about 90 centimetres up. The combined perimeter passes five metres, one of the thickest trunks in the city, under a crown roughly 20 metres across; the city's own records put the height somewhere between 22 and 27 metres and cannot agree which. River she-oaks come from the riverbanks of eastern Australia, where they hold sandy banks together through flood season, and they were planted around the Mediterranean for exactly that toughness. Stand under it on a windy afternoon and the sound settles what the botany started: the hanging foliage catches wind with the same hiss a pine gives, from a tree that is nothing like one.
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Photo : Herodotptlomeu (CC BY-SA 3.0)
12
The Mexican Oak of the Ciutadella
Mexican White Oak (Quercus polymorpha) · about 140 years · Sant Pere, Santa Caterina i la Ribera, Ciutat Vella
An oak with no lobes in its leaves, and the only one of its kind alive in Catalonia. Quercus polymorpha grows wild from Texas down through Mexico into Guatemala and Honduras, keeping leathery, plain-edged leaves for most of the year, and almost nobody in Europe plants it. Barcelona's single specimen has been leaning out over the sand of Parc de la Ciutadella since about 1887, the year the park was being rebuilt for the Universal Exposition that opened next door the following spring. It is not a big tree beside its neighbours, roughly eight metres tall with a trunk two and a half metres around, but it throws an 11 metre crown sideways from a stem that gave up on vertical decades ago and now sweeps out low enough to put a hand on. The species name means many-formed, and it was given because the leaves vary so much from tree to tree that botanists kept describing the same oak twice under different names. That is the thing to check when you find it. Hold a leaf, look for the shape every oak you know is supposed to have, and watch the family resemblance quietly fall apart in your hand.
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Photo : Teresa Grau Ros (CC BY-SA 4.0)
13
The Osage Orange of the Ciutadella
Osage Orange (Maclura pomifera) · about 113 years · Sant Pere, Santa Caterina i la Ribera, Ciutat Vella
In late autumn this tree drops what look like green brains onto the path. The fruit of the Osage orange is the size of a grapefruit, yellow-green and almost fluorescent when fresh, its surface a mass of folds and channels, and it is inedible to more or less everything alive today. The usual explanation is that it fed animals that no longer exist, ground sloths and mammoths that swallowed the fruit whole and carried the seed away, which leaves the tree serving meals nobody has ordered for ten thousand years. It comes from a small range across Texas, Arkansas and Louisiana, where its wood made the finest bows in North America and gave both the Osage nation its trade and this tree its name. Europe imported it early in the 19th century and never took to it. Barcelona's specimen went into Parc de la Ciutadella around 1913 and now carries a trunk about two and a half metres around under a crown the city measures at anywhere from 13 to 19 metres. It is deciduous, so the timing matters: come in late October or November and the fruit is lying under it, with a few hanging on into winter after the leaves have gone.
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14
The Red Gum of the Placa de les Caramelles
River Red Gum (Eucalyptus camaldulensis) · over 100 years, city register says about 120 · El Raval, Ciutat Vella
Close to 30 metres of Australian tree stands in the Raval, the most tightly built neighbourhood in Barcelona and close to the last place with room for anything this size. The river red gum grew up inside the walled grounds of the Casa de la Caritat, the charity house that took in the city's foundlings and destitute for a century and a half, which is the only reason there was open soil here at all. From Placa de les Caramelles you get the whole thing: a pale straight trunk about three metres around, bare for a long way up before the crown begins. Eucalyptus camaldulensis follows the seasonal rivers of inland Australia across almost the entire continent, surviving drought by shedding whole limbs and resprouting from the base, which is also why nobody sensible parks under one. The buildings around it reopened in 1994 as the CCCB arts centre, the same year the city added the tree to its catalogue. Its age is the soft part of the record. The city gives 1904, no independent source confirms it, and the city's own two published versions of the same entry differ by three metres in height and 20 centimetres in girth. Read the date as the register's best guess.
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15
The Holm Oak of the Bacardi Gardens
Holm Oak (Quercus ilex) · about 120 years · La Maternitat i Sant Ramon, Les Corts
This oak is the only part of a rich man's garden that was never sold, demolished or built over. The land was a farm called Can Ermengol until the Bacardi family bought it late in the 19th century and put up a manor house for Baltasar de Bacardi i Janer, with grounds laid out purely for his own recreation. The oak went in around 1904. When his granddaughter Anna Bacardi i Ribas died in 1958, her three children began breaking the estate up and selling it; the house came down for the widening of Travessera de les Corts, and in 1963 the city expropriated what was left of the garden and opened it to everyone who had never been allowed in. The oak now stands roughly 16 metres tall with a trunk just over two metres around, among palms and plane trees left from the same private planting, five minutes from the Camp Nou crowds. Holm oaks keep their small hard leaves all year and grow slowly enough that a century leaves them looking unhurried. Barcelona catalogued this one in 1994, which means it cannot be removed for any reason, and that turned out to be a useful piece of paper: in April 2026 the city approved a redesign of the whole site around it.
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Photo : Pere Lopez Brosa (pere prlpz) (CC BY-SA 3.0)
16
The Wild Olive of Park Guell
Olive (Olea europaea) · city register says 1771, about 255 years; not independently dated · Park Guell, Gracia
The city's own register dates this wild olive to 1771, which would make it older than the tree Barcelona calls its oldest. That title belongs to the holm oak in Gracia at about 250 years, and the oak has something this olive does not: a dendrochronologist's count of its rings. The olive carries an approximate birth year typed into a municipal catalogue with nothing published behind it. So the honest position is that Barcelona may hold an older tree than the one it advertises, and nobody has done the work to settle it. What is not in question is the tree itself. It is an ullastre, the wild form of the olive that grows all round the Mediterranean as a low, scrubby, many-stemmed thing nobody looks at twice, and this one went up like a proper tree instead, somewhere between 14 and 17 metres with a crown spreading over 13 metres above a Park Guell retaining wall. That is why it was catalogued in 1996: not for its age, but because a species every Catalan can name had never been seen behaving like this. It was already on the hillside more than a century before Eusebi Guell bought the land.
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Photo : Pere Lopez Brosa (pere prlpz) (CC BY-SA 3.0)
17
The Pica-Pica Tree of the Teatre Grec
Norfolk Island Hibiscus (Lagunaria patersonii) · about 103 years · Montjuic, Sants-Montjuic
Barcelona planted this tree for its flowers and got itching powder with them. The lagunaria is known across Catalonia as the pica-pica, the scratch-scratch, because the inside of its seed capsules is packed with fine bristles that break off into skin and stay there. The flowers are the reason anyone forgives it. Once a year the whole crown fills with thousands of pink blooms shaped like mallows, which is a strange thing to find fifteen metres up, because flowers like that normally belong to weeds on a roadside verge. The city's own assessment says no other lagunaria in Barcelona, and fewer than half a dozen have ever been planted here, has grown into anything close to this shape. It went into the ground in 1923, while the whole hillside was being rebuilt from quarry workings into gardens for the 1929 International Exposition, and it now stands to the left of the amphitheatre below the restaurant terrace with a trunk 2.4 metres round. The species comes from Norfolk Island and Lord Howe Island in the Pacific, where it grows on sea cliffs. Time the visit: the gardens shut to the public from 15 June to 7 August for the festival that fills the theatre.
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18
The Bunya Pine of the Teatre Grec
Bunya Pine (Araucaria bidwillii) · about 106 years · Montjuic, Sants-Montjuic
A bunya pine drops cones the size of a football that can weigh ten kilograms, from seventeen metres up. In Queensland, where the species is native, park keepers rope off the ground under them in season and put out warnings. Barcelona's specimen has been doing this quietly in the Teatre Grec gardens since about 1920, on the path just before the viewpoint, and the city catalogued it in 2011 as probably one of very few anywhere in town. Araucaria bidwillii is the last species left in its own section of the genus, a survivor of a lineage already ancient when the Jurassic ended, and it is built like nothing else on this hillside: a straight column with branches held out in flat symmetrical whorls, each one lined with stiff triangular leaves sharp enough to draw blood. In its homeland it reaches fifty metres. The seeds inside those cones are edible and starchy, and they are in no hurry, taking three to six months underground before anything appears above it. Look up rather than out. The crown is only about eight metres across, and it is the silhouette of the thing against the sky, all right angles where every other tree here has curves, that makes people stop on the path.
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Photo : Pere Lopez Brosa (pere prlpz) (CC BY-SA 3.0)
19
The Coral Tree of the Laribal Path
Coral Tree (Erythrina corallodendron) · about 103 years · Montjuic, Sants-Montjuic
Barcelona cannot decide what this tree is. The city's own tree pages call it Erythrina corallodendron and say it is the only one of its kind in any garden in the city. The city's open data file calls it Erythrina falcata. The surveyor who mapped it for OpenStreetMap wrote down Erythrina lysistemon. Three names for one trunk, and all three are coral trees, a genus that flowers in blazing red spikes and has kept botanists arguing for two centuries. What nobody disputes is the tree. It stands on the path running between the Teatre Grec gardens and the Laribal gardens, planted around 1923, and it has thrown a crown twenty metres wide over a walkway barely three metres across, so the path goes underneath it rather than around. The trunk is 2.7 metres round and leans out over the slope. The city credits the placement to Jean-Claude Nicolas Forestier, the French landscape engineer who terraced this side of Montjuic for the 1929 Exposition, and notes that the tree was given an ideal spot and duly took advantage of it. Whatever it turns out to be, there is only one here.
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20
The Tipu Tree of Placa Carles Buigas
Tipu Tree (Tipuana tipu) · about 101 years · Montjuic, Sants-Montjuic
The tipu tree is one of the commonest trees on Barcelona's streets, and this is the one the city measures the others against. Its own record calls this possibly the largest by trunk perimeter of any tipu tree it knows of in the city, at 3.3 metres round, and dates it to 1925, which puts it in the first wave of plantings that brought the species over from Bolivia and northern Argentina. The experiment worked. Tipuanas turned out to handle Barcelona's heat, its drought and its pavements better than almost anything else on offer, and the city kept planting them until they became ordinary. Anyone who parks under one in summer knows the other half of that decision: tipuanas host sap-sucking insects that rain a fine sticky mist onto whatever sits below. This one stands at the foot of Montjuic a few steps from the Magic Fountain, throwing a 23 metre crown over a square that most visitors cross on their way somewhere else without once looking up. In late May and June it turns orange-yellow with pea-shaped flowers, then drops them, and for about a week the paving is the same colour as the tree.
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21
The Ash of the Sot de l'Estany
Narrow-Leaved Ash (Fraxinus angustifolia) · planting date never recorded · Montjuic, Sants-Montjuic
Three of the four trees the Catalan government calls monumental in Barcelona are foreign rarities. This one is a narrow-leaved ash, a tree that grows along half the rivers in Spain, and it beat all of them for height. At 29 metres it is the tallest of its species measured anywhere in Catalonia according to the government's own file, and it got there by growing in a hole. The Sot de l'Estany is an abandoned quarry pit inside the historic botanical garden, cut into the flank of Montjuic, and its walls hold cool damp air well enough to sit up to four degrees below the temperature outside. Anything planted at the bottom behaves as though it were somewhere much wetter and a long way north. This ash took that microclimate and went straight up, ending with a 2.5 metre trunk under a crown only 15 metres across, the proportions of a forest tree rather than a park one. The Generalitat declared it monumental on 2 April 2025 along with three neighbours, all four standing within about thirty metres of each other at the bottom of the same pit. Nobody wrote down when it was planted, and nobody has counted its rings.
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22
The Sycamore of the Sot de l'Estany
Sycamore (Acer pseudoplatanus) · planting date never recorded · Montjuic, Sants-Montjuic
Thirty metres of tree on a trunk 1.38 metres round. That is the shape of something that spent its whole life climbing towards a patch of sky, and it is why this sycamore is the odd one out among Barcelona's four monumental trees. Acer pseudoplatanus is the workhorse maple of northern and central Europe, the tree that lines streets in Vienna and colonises every gap in Britain. In Barcelona it barely holds on. The summers are too long and too dry, and it is rare enough here that the Catalan government named this one monumental on 2 April 2025 partly for being ordinary somewhere else. It lives in the Sot de l'Estany, a quarry pit inside the historic botanical garden that keeps cool air the way a cellar does, several degrees below the hillside above it. That is the whole explanation. Take a northern tree, drop it into the one cold damp hole on a Mediterranean mountain, and it grows to a height it would be pleased with in Bavaria, on a trunk that stayed slender because there was never any reason to spread sideways. Nobody recorded when it went in.
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23
The Stone Pine of the Palau de Pedralbes Gardens
Stone Pine (Pinus pinea) · about 133 years · Pedralbes, Les Corts
The tree came first. This stone pine was planted in 1893 on the Can Feliu farmland that later became the Finca Guell estate, and it was already thirty years old when the property passed to the city in the 1920s and the house on it became the Barcelona residence of Alfonso XIII. When Nicolau M. Rubio i Tuduri redesigned the grounds between 1925 and 1927, he built his plan around the pine rather than the other way round: it stands alone in the meadow beside the palace, next to a sculpted female figure, holding the open space by itself. It is 24 metres tall on a trunk three and a half metres round, and Barcelona catalogued it as a Tree of Local Interest in 1993. What it has watched from that one spot: a farm turned into an estate, an estate turned into a royal residence, a king who left in 1931 when the Second Republic arrived and never came back, and a palace that has spent the decades since as a museum. Stone pines are the umbrella pines of the Mediterranean coast, built to stand in the open with all their weight carried in a flat crown, and this one has had the room to do it properly for 133 years. Most trees in this city spend their lives competing for light with a building.
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24
The Himalayan Cedars of the Palau de Pedralbes Gardens
Himalayan Cedar (Cedrus deodara) · about 123 years · Pedralbes, Les Corts
Barcelona's tree register lists this as one protected item and 23 trees. The Himalayan cedars of the Palau de Pedralbes gardens went in around 1903, and when Nicolau M. Rubio i Tuduri redrew the grounds in the 1920s he worked around them: accounts of the redesign say he respected an important group of cedars already growing there, which is why a planned 20th-century garden has a stand of older conifers sitting in the middle of it. The register gives the group one coordinate, one planting year and one representative trunk figure of 3.4 metres, with the tallest reaching about 25 metres. Being straight about the shape of it: we have not measured how far those 23 trees spread. One source puts the large specimens near the garden entrance and that is where to start, but this is a group rather than a single trunk to stand at, and the distance between the first and the last of them may be longer than the word grove suggests. Cedrus deodara comes from the western Himalaya, where it grows above 1,500 metres and was cut for temple timber for centuries. Barcelona gives it no winter worth the name and it grows accordingly: drooping leader shoots, branches sweeping down nearly to the grass, and enough of them together to make the air under the canopy noticeably cooler in August.
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25
The Barbary Thuja of the Palau de Pedralbes Gardens
Barbary Thuja (Tetraclinis articulata) · about 103 years · Pedralbes, Les Corts
There are only a handful of these in any European garden. Tetraclinis articulata, the Barbary thuja or arar, grows wild in Morocco, Tunisia, Malta and one relict pocket of southeast Spain, and it is a threatened conifer at home, which makes a century-old specimen in a Barcelona park a genuine oddity rather than an ornamental choice. It was planted here around 1923 and catalogued as a Tree of Local Interest in 1993. Its measurements depend on who took them and when. The city register gives 14 metres of height on a trunk 1.2 metres round; a Barcelona flora survey devoted to this exact tree gives 10 metres and a narrower crown. Both agree on the species, the planting year and the protected status, so the honest answer is that it stands somewhere between the two figures, and is shorter than nearly everything around it either way. Up close it does not read as a conifer at all. The foliage is jointed and scaled, flattened into small articulated sprays, and the cones are four-valved and woody, closer to a piece of hardware than to a pine cone. The resin the species bleeds is sandarac, which was the standard varnish for furniture and instruments for centuries. It is the least conspicuous tree in these gardens and the one a botanist would walk to first.
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The Stone Pines of the Torre Girona Gardens
Stone Pine (Pinus pinea) · about 122 years · Pedralbes, Les Corts
A supercomputer lives in the chapel these pines grew up beside. Torre Girona was built in 1860 as the summer estate of Manuel Girona i Agrafel, banker and later mayor of Barcelona; the technical university took the grounds over a century later, built its northern campus around them, and installed the MareNostrum machine inside the estate's deconsecrated chapel, where it sits in a glass box under the vaulting. The two stone pines predate all of it. They were planted around 1904, are catalogued together by the city as a single protected item, and stand 21 metres tall on trunks 3.6 metres round. A Catalan gardens journal that surveyed this garden calls them colossal and credits them with witnessing more than a hundred years of the estate's history, which for once is not an exaggeration: they were there for the private garden, the university, the construction and the machine. The access is worth reading carefully. This was private university ground until an April 2019 agreement handed its management to the city, and it is a public park now. What we could not confirm is today's exact timetable: the hours are posted, they are seasonal and the gates close at night, so check before making a special trip late in the day.
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The Aleppo Pine of the Torre Girona Gardens
Aleppo Pine (Pinus halepensis) · about 122 years · Pedralbes, Les Corts
Aleppo pines are the trees that come back after fire, their cones prised open by the heat, colonising burnt Mediterranean hillsides faster than anything else growing on them. This one has spent 122 years doing the opposite: standing beside an ornamental pond in Pedralbes with water, room and nothing to compete with, reaching 23 metres, which makes it the tallest of the three protected trees in the Torre Girona gardens. It was planted around 1904 on the estate the banker Manuel Girona built in 1860, and the city catalogued it in 1994 with a trunk of 2.9 metres round. A Catalan gardens journal describes a Pinus halepensis climbing the slope beside the pond's viewpoint here, which is exactly where the register's coordinate puts it. The species is the default pine of this coastline, the one on every dry hill between Barcelona and Provence, and that is precisely what makes an old one worth the walk. In the wild an Aleppo pine rarely gets to grow into its full shape, because fire, thin soil and competition tend to take it first. Same caution as its neighbours: the garden is public and city managed since 2019, but the hours are posted and seasonal and the gates shut at night.
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The Bottle Tree of the Torre Girona Gardens
Bottle Tree (Brachychiton populneus) · about 122 years · Pedralbes, Les Corts
The strangest tree in these gardens is the one you have to go looking for. A Catalan gardens journal that walked the Torre Girona grounds found the Brachychiton populneus halfway into the wooded part, off the obvious route, which is a fair description of how an Australian bottle tree ends up in a Barcelona park in the first place. It was planted around 1904, stands 22 metres tall and 2.5 metres round, and the city catalogued it in 1994. The name is the point: the trunk swells at the base into a bottle, storing water against drought in a way that looks slightly wrong to a European eye, like a tree drawn from memory. In its native eastern Australia the species is emergency fodder, felled for livestock when the paddocks fail. Here it has never once had to prove it. The estate around it was a banker's summer house from 1860 before the technical university built a campus on the grounds, which is why the walk to this tree goes past engineering buildings. The garden has been municipally managed since an April 2019 agreement and is genuinely open to the public, but the hours are posted, seasonal and gated after dark, and we could not confirm the current timetable, so treat a late visit as a gamble.
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The London Plane of the Vil.la Amelia Gardens
London Plane (Platanus x acerifolia) · about 106 years · Sarria, Sarria-Sant Gervasi
Twenty-six metres tall and 26 metres across, which is what a plane tree looks like when it has never had to compete for anything. It was planted in 1920 in what were then the private grounds of the Quinta Amelia, the estate the banker Ignasi Girona built and named for his wife, Amelia de Vilanova, and it has had open lawn around it ever since. A note on its age, because descriptions of the garden get this one wrong. Several still call it a plane of nearly 90 years, a figure copied forward from whenever it was first written down. The city register's planting year makes it 106. The garden changed a great deal more than the tree did. Barcelona took the estate over and the mansion came down; sources disagree on the year, giving 1930 in some accounts and 1969 in others, and we have not been able to settle which is right. The layout you walk through now dates from a 1970 redesign by Joaquim Casamor, the city's director of parks and gardens, who kept the mature trees and built a public garden around them. A bronze dryad, a tree nymph, by Ricard Sala stands in the central pond, which is either a coincidence or somebody's quiet joke about what the garden is actually for.
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The White Eucalyptus of the Vil.la Amelia Gardens
Tasmanian Blue Gum (Eucalyptus globulus) · about 122 years · Sarria, Sarria-Sant Gervasi
A trunk 5.2 metres round on a tree planted in 1904 tells you what a blue gum does when nothing stops it. Eucalyptus globulus is native to Tasmania and a strip of southern Victoria, and it was planted all over the Mediterranean from the 19th century onward for one reason: speed. Nothing else put up timber and shade that fast. Most were cut long before they got old. This one was left alone, and 122 years later it carries the thickest trunk of the protected trees in the Vil.la Amelia gardens at only 18 metres tall, wide rather than high. The bark is the thing to look at. Blue gums shed in long ribbons through the summer, leaving a smooth grey-white surface underneath that looks polished, and the strips hang off the trunk for weeks before they drop. Crush a fallen leaf and it smells like a cold remedy, which is no coincidence: this is the eucalyptus the oil is named for. It has stood here since the garden was the private Quinta Amelia, through the estate's expropriation, the demolition of the mansion and the 1970 redesign that turned the grounds into a public park. Barcelona catalogued it in 1994, and it is one of the few trees in the city that arrived from the far side of the world and outgrew the locals.
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The Peruvian Pepper Tree of the Vil.la Amelia Gardens
Peruvian Pepper (Schinus molle) · about 103 years · Sarria, Sarria-Sant Gervasi
The pink peppercorns in an expensive pepper grinder are not pepper, and this is the tree they come from. Schinus molle sits in the cashew family, unrelated to black pepper, and its hanging clusters of pink berries were the substitute that ended up named after the real thing. This one was planted around 1923 and catalogued by Barcelona in 1993, standing 12 metres tall with a trunk 2.7 metres round. Be clear about what is certain here. The city's own catalogue and a published description of the garden both confirm the species and the tree, but the planting year rests on the register alone, with nothing independent to check it against, so 103 years is the register's figure rather than a corroborated one. It is the softest tree in the Vil.la Amelia gardens. Peruvian pepper hangs its foliage in fine weeping sprays that move in any wind at all, a completely different physics from the planes and pines around it, and the berry clusters go dusty pink in autumn and hang on into winter. The species came to Spain from the Andes with the colonial trade in the 16th century, which makes it one more foreigner in a garden a banker built for his wife and the city later opened to everybody.
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The Canary Island Palms of the Vil.la Amelia Gardens
Canary Island Date Palm (Phoenix canariensis) · about 132 years · Sarria, Sarria-Sant Gervasi
The city register counts fourteen. The garden's own chronicler counts fifteen. Either a palm has been lost since the catalogue was written, or one tree in the row is something else, and rather than quietly pick a number we would rather say which part we do not know. What is not in dispute: a double line of Canary Island date palms, planted around 1894, flanking the main avenue of the Vil.la Amelia gardens like a colonnade with a path down the middle. They stand 19 metres tall, roughly 2.3 metres round at the trunk, and Barcelona catalogued them together as a single protected item in 1994. Standing at one end and looking down the avenue is the whole point of them: one Phoenix canariensis is a palm, but 14 of them at 130 years old are architecture. The species comes from the Canary Islands and has had a hard century on the mainland, where the red palm weevil has killed date palms in large numbers since it arrived, which makes an intact avenue of century-old specimens less ordinary than it looks. These were planted while the garden was still the private Quinta Amelia. They survived the expropriation of the estate and the demolition of its mansion, and they now line a path anyone can walk for free.
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The Mastic of Hort de l'Avi
Mastic Tree (Pistacia lentiscus) · not documented; the register lists no planting year · el Coll, Gracia
A mastic is supposed to stay a shrub. Pistacia lentiscus grows low and scrubby across the Mediterranean, the kind of plant nobody looks at twice, and this one never got the memo. Two of its main limbs run out nearly horizontal, thicker than a wrist, one holding itself in open air and the other simply resting on the ground, together spreading a canopy of 20 to 25 square metres from a base no wider than a doorway. That is a shrub's growth habit at a tree's scale, which is presumably why Barcelona catalogued it in 2013 as a tree of local interest rather than as landscaping.
It stands at the back entrance to Park Guell's free wooded slope, on the path in from Carrer de la Farigola, right beside Hort de l'Avi. That allotment garden opened in 1986 after a group of elderly Gracia residents asked the city for the grounds of Park Guell's demolished old caretaker's house, and residents over 65 still work it today on a lottery basis. The mastic grows at the shared access path, not inside the fenced plots, so anyone can reach it without a permit. Nobody has dated it. No source records a planting year and no dendrochronologist has measured it, so its age stays an open question rather than a number. It stands about 500 metres from the Wild Olive of Park Guell, an easy add to that same hillside walk.
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The Camphor Tree of the Historic Botanical Garden
Camphor Tree (Cinnamomum camphora) · about 93 years · Montjuic, Sants-Montjuic
This camphor tree is nearly twice as wide as it is tall. The city register puts its crown at 27 metres across and its height at only 15, the proportions of a tree that never had to compete for light and spread sideways instead, and its trunk measures 4.4 metres around. Camphor is what the wood smells of when it is cut, and for most of the twentieth century it was what mothballs and chest rubs were made from, distilled from chipped Cinnamomum camphora shipped out of Taiwan and Japan until the chemists worked out how to make it synthetically. Barcelona's tree was planted in 1933 in the Sector de la Masia of the old botanical garden on Montjuic, a collection laid out on ground reworked for the 1929 International Exposition. It has stood there through the war that broke out three years later, the decades afterwards when the garden was left to go half wild, and the opening of the new botanical garden further up the slope in 1999, which is what turned this one into the historic garden rather than simply the garden. The city catalogued it as a Tree of Local Interest in 1993. The land belongs to the science museum rather than the council, which is a matter of paperwork rather than a locked gate.
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The Black Locust of the Ciutadella
Black Locust (Robinia pseudoacacia) · not dated; the register's age column reads '100 anys' rather than a year · Sant Pere, Santa Caterina i la Ribera, Ciutat Vella
A trunk of 4.3 metres on a tree only 12 metres tall makes this the stoutest black locust in Barcelona and the only one the city has ever put on its register. Black locusts usually run up thin and fast and then fall over. This one went sideways and stayed, and it grows in the parterre between the Passeig de Joaquim Renart and the Cascada, the monumental fountain a young Gaudi worked on as a student assistant. How old it is nobody has established. The register's age column holds the words '100 anys' where a planting year should be, which is somebody's estimate written into the wrong box rather than a date anyone has checked, and the tree was only catalogued in 2024. What is certain is the ground it stands on. The park is 1888 work, laid out for the Universal Exposition on the cleared site of the Bourbon citadel that Barcelona spent 150 years resenting and then demolished. The species itself was one of the first American trees to reach Europe, planted in Paris around 1601 by Jean Robin, the royal gardener it is named after. In late spring the crown fills with white pea flowers heavy enough to hang and strong enough to smell before you have found the tree.
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Photo : Clifton Ladd, C.W.B (CC BY)
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The London Plane of the Ciutadella
London Plane (Platanus x acerifolia) · planting date never recorded · Sant Pere, Santa Caterina i la Ribera, Ciutat Vella
The city register lists 273 plane trees under a single entry for the Rambles. This is one of the few it catalogued on its own. The London plane is the default tree of Barcelona's streets, planted by the hundred and cut back to knuckles every winter, which is exactly what makes an unpruned one worth walking to. This tree stands between the Ciutadella lake and the zoo fence, carrying a 3.6 metre trunk under a crown 24 metres across and 25 metres tall, very nearly as wide as it is high. That shape is simply what a plane does when nobody interferes. Its age is honestly unknown: the register took all the measurements and left the planting year blank, no other source dates it, and it went onto the list in 2021 on size alone. The park around it opened in 1888 for the Universal Exposition and most of the big trees in it date from that work or the decades just after, which puts this one somewhere above a century without proving anything. The species is an accident to begin with, a hybrid of the American and oriental planes that turned up in a seventeenth century garden and proved able to shrug off soot, drought and compacted roots better than either parent.
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The Japanese Cheesewood of the Ciutadella
Japanese Cheesewood (Pittosporum tobira) · not documented; the register lists no planting year · Sant Pere, Santa Caterina i la Ribera, Ciutat Vella
This is a hedge that got away. Pittosporum tobira is the standard clipped shrub of Mediterranean car parks and hotel forecourts, usually held below waist height and almost never allowed a single trunk at all. This one has a trunk 1.55 metres around and a crown six metres wide, which is why the city added it to the register of trees of local interest in 2017, the only one of its species on that list. The register does not even record a height for it, an omission that says something about how unexpected the entry is. It grows in the Parc de la Ciutadella in front of the Glorieta de la Transsexual Sonia, the park's old bandstand, which the city renamed for a woman killed there and which is now one of Barcelona's memorials to violence against trans people. The tree is the quiet part of that corner. In spring it carries small cream flowers that smell of orange blossom strongly enough to reach the path, which is where the plant's other name, mock orange, comes from. Nobody has dated it. Pittosporum thickens slowly enough that a trunk this size suggests decades rather than years, but the register gives no planting year and no second source offers one.
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The Norfolk Island Pine of the Casa de la Misericordia
Norfolk Island Pine (Araucaria heterophylla) · planting date never recorded · El Raval, Ciutat Vella
A tree from a Pacific island eight kilometres long stands 27 metres over one of the most densely built neighbourhoods in Europe. The Norfolk Island pine in the courtyard of the Casa de la Misericordia is the tallest thing in this part of the Raval, visible above the rooftops long before you find the doorway on Carrer d'Elisabets. Its trunk is a modest 1.5 metres around, because the species grows like a mast rather than a barrel, throwing out whorls of branches in tidy tiers and going straight up. That was precisely the appeal when Cook reached Norfolk Island in 1774 and reported the trees as a supply of masts for the Royal Navy. The timber turned out too brittle and the scheme came to nothing, which is roughly how the species ended up as an ornamental instead, planted in warm coastal cities from Sydney to here. The courtyard it stands in was a foundling house and orphanage, and the four fan palms beside it went in around 1904. The pine itself has no recorded planting date at all and joined the city register in 2016 on its size. The yard is now a public passage with a bookshop and a cafe in it, which makes this one of the easiest large trees in Barcelona to walk to.
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The Oriental Plane of Placa de la Universitat
Oriental Plane (Platanus orientalis) · about 93 years · L'Antiga Esquerra de l'Eixample, Eixample
Every plane tree on the streets around this one is a hybrid. This is one of the parents. The city register carries eleven separate entries for London planes and exactly one for Platanus orientalis, the eastern species that crossed with the American plane in some seventeenth century garden to produce the tree that now lines most of the Eixample. The difference shows in the leaf, cut far more deeply into narrow lobes, and in the habit, which is lower and looser than the hybrid's. The register dates this one to 1933 and puts it at 18 metres with a two metre trunk under a crown almost as wide as the tree is tall. It was planted during the Second Republic, three years before the war, on the square in front of the university's main building, and it has spent its entire life on one of the busiest crossings in the city: trams first, then traffic, then the demonstrations that a university square inevitably collects. The species is the plane of Greek and Persian writing, the tree Herodotus has Xerxes stopping to decorate with gold on the march west. This one gets exhaust fumes and shade duty, and handles them about as well.
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The Avocado of Placa de Can Bruixa
Avocado (Persea americana) · about 81 years · Les Corts
There is an avocado tree 17 metres tall growing in a square in Les Corts. Persea americana is a Central American species that Europe imports by the container and almost never plants, because it wants heat, water and no frost, and because a tree grown from a stone takes a decade or more to fruit and then usually disappoints whoever planted it. This one went into the ground in 1945 and has not moved since, on Placa de Can Bruixa, in a district Barcelona had annexed from its own village only in 1897. Its trunk is slight at 80 centimetres around, and the height is the surprising part: an avocado that nobody prunes for picking simply goes up, which is why commercial groves keep theirs cut low and wide. The city catalogued it as a Tree of Local Interest in 2003. It stands about 500 metres from the magnolia in the old Maternity Gardens, which makes the pair a comfortable half hour on foot through a part of the city that almost no visitor reaches. Whether it sets fruit in a given year depends on the winter it has just had, and when it does the crop is well above head height and staying there.
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The Pepper Tree of Carrer Joaquim Blume
Longleaf Pepper Tree (Schinus longifolia) · about 110 years · El Poble-sec, Sants-Montjuic
Nobody quite agrees what this tree is. The city register files it as Schinus longifolia, an Argentine and Uruguayan species. The mappers at OpenStreetMap have it down as Schinus polygama, the Chilean huingan, and the Catalan name the register itself uses for the tree, huingan, belongs to that second one. The two are close relatives in the cashew family, both small, tough, drought-hardy South American trees, and separating them takes a look at the leaves and the thorns rather than a look at the label. So the species stays an open question here. The date does not. It was planted in 1916, which makes it older than most of the street around it and one of the oldest trees in Poble-sec, and the city catalogued it in 1996. It is a small thing by the standards of this list: eight metres tall, a 1.6 metre trunk, a crown about as wide as the tree is high, standing at the foot of Montjuic. The hill above it was torn up and rebuilt twice in its lifetime, for the 1929 International Exposition and again for the 1992 Olympics, and the street kept its tree through both. The genus is the one that gives pink peppercorns, though this is not the species in the grinder.
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The Osage Orange of Carrer Maria Montessori
Osage Orange (Maclura pomifera) · about 78 years · El Poble-sec, Sants-Montjuic
Before barbed wire, this tree was the fence. Osage orange grows dense, thorny and fast, and through the 1850s American farmers planted it in hedge lines across the prairie states to make a barrier that livestock would not push through: horse high, bull strong and hog tight, as the sales pitch went. Barbed wire arrived in the 1870s and ended the trade within a decade, by which point the species had already been shipped to Europe as a curiosity and largely ignored. Barcelona has two on its register and this is the younger of them, planted in 1948 on Carrer Maria Montessori below Montjuic, with a 1.4 metre trunk, 12 metres of height and a crown 15 metres across that is wider than the tree is tall. Its counterpart down in the Parc de la Ciutadella went into the ground 35 years earlier and is the thicker tree; this one has the better spread. The city catalogued it in 1998. What both share is the fruit, a heavy green sphere the size of a grapefruit with a surface like folded brain, which drops in autumn and is eaten by nothing that currently exists. It stands a few minutes' walk from the pepper tree on Carrer Joaquim Blume.
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The Horse Chestnut of Placa Carles Buigas
Horse Chestnut (Aesculus hippocastanum) · about 89 years · El Poble-sec, Sants-Montjuic
Barcelona's register of trees of local interest runs past two hundred entries and contains exactly one horse chestnut. This is it, and the date on it is 1937, which was not a good year to be planting anything in this city. The air raids on Barcelona ran through that year and the next, and the hill directly above the square held anti-aircraft positions. The tree went in anyway and now stands 20 metres tall with a trunk 1.9 metres around, a decent size for a species that does not really belong at this latitude. Aesculus hippocastanum comes from a few mountain valleys in the Balkans, wants cool damp summers, and tends to sulk in Mediterranean cities, going brown at the edges by August in a hard year. This one has managed 89 seasons of it. It shares Placa de Carles Buigas with a tipu tree that is also on the register, so the two are one stop rather than two, on the walk up from Espanya towards the Montjuic gardens. The conkers are why the tree travelled so far beyond its native range in the first place and why generations of children knew it by name: shiny, useless, and briefly the most valuable object in a schoolyard.
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The Jujube of the Jardins Joan Maragall
Jujube (Ziziphus jujuba) · about 68 years · Montjuic, Sants-Montjuic
This garden opens two days a week, which is most of the reason almost nobody has seen the tree in it. The Jardins Joan Maragall surround the Palauet Albeniz, a small neoclassical pavilion built for the 1929 International Exposition and kept ever since as the residence the Spanish royal family uses when it is in Barcelona. The public is let in at weekends. The jujube standing there was planted in 1958, reaches 10 metres with a 1.6 metre trunk and a crown 12 metres across, and was catalogued as a tree of local interest in 1998. Ziziphus jujuba has been cultivated in China for something like four thousand years, which makes it one of the oldest orchard trees on earth, and it reached the Mediterranean early enough that the Romans were already growing it. The fruit is the size of an olive and turns from green to a deep red brown. Fresh it tastes like a slightly floury apple; dried and wrinkled it tastes like a date, which is where the English name Chinese date came from. It is a thorny, slow, obstinate tree that will grow in poor dry ground, and it is planted here purely as an ornamental. Check the opening days: on a weekday the gate is as close as you get.
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The Ginkgo of the Jardins de Mossen Cinto Verdaguer
Ginkgo (Ginkgo biloba) · about 68 years · Montjuic, Sants-Montjuic
The ginkgo has no living relatives. Not a rare genus inside a large family: the entire order it belongs to died out except for this one species, and fossil leaves from 200 million years ago are close enough to the modern ones that a botanist can match them by eye. It survived in a handful of Chinese temple groves and was carried out from there first by monks and then by European collectors. Barcelona's is a young example, planted in 1958 in the Jardins de Mossen Cinto Verdaguer on the Montjuic hillside, now 17 metres tall with a crown nearly as wide and a trunk 1.4 metres around. The garden it stands in is the city's bulb garden, terraced and best known for its tulips and narcissi in spring and its water lilies in summer, which leaves the ginkgo the autumn entirely to itself. That is the month worth coming for. The leaves turn from green to a flat butter yellow over about a fortnight, then drop almost all at once, often within a single still day, leaving a gold circle on the ground that is the entire point of the tree. The city catalogued it in 1998. The gardens are free and open daily.
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Photo : Pere López Brosa (CC BY-SA 4.0)
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The Judas Tree of Placa Joanic
Judas Tree (Cercis siliquastrum) · about 70 years · La Vila de Gracia, Gracia
This tree is twice as wide as it is tall. Five metres of height, a crown ten metres across and a trunk 1.8 metres around, the proportions of something that decided early to spread rather than climb. It is a Judas tree, and the Catalan name on the city register, arbre de l'amor, is a good deal kinder than the English one. The English name comes from the story that Judas hanged himself from a Cercis and its white flowers turned red with shame; the likelier explanation is that arbre de Judee, tree of Judea, got misheard somewhere along the way, Judea being a place it genuinely grows wild. What the tree does in April accounts for both names. The flowers break straight out of the bark, off the old wood of the branches and the trunk itself, before a single leaf has opened, so the whole frame of the tree turns magenta for a fortnight and then greens over as if nothing happened. This one was planted in 1956 on Placa de Joanic and catalogued in 1996. It stands about 330 metres from the holm oak on Carrer de l'Encarnacio, the oldest measured tree in Barcelona, which makes the two of them a short and unusually good walk through the middle of Gracia.
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The Silky Oak of Jardins dels Drets Humans
Silky Oak (Grevillea robusta) · la Marina de Port
A Philips factory once stood where this Australian silky oak now grows, and the garden around it still carries the shape of that history: workers' flowerbeds laid out in the 1960s, redesigned decades later into a public park about human rights, its paths lined with 30 illuminated panels quoting the Universal Declaration article by article.
The tree itself predates all of that. Barcelona catalogued it as a tree of local interest in 2011, and the city's own register puts it at a striking 4.1 metres round and 32 metres tall, among the largest silky oaks recorded anywhere outside Australia. An independent measurement taken in 2017 found a notably smaller trunk, 2.4 metres, which is either six years of unusually vigorous growth or two different ways of measuring the same tree. Both readings are kept here rather than picking one.
Grevillea robusta is native to the subtropical rainforests of eastern Australia, grown worldwide as an ornamental and, more prosaically, as a nurse tree for coffee plantations. This one has nothing to nurse. It stands alone in a public garden built on land a factory once used for something else entirely.
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The Hackberry of Jardins dels Drets Humans
Mediterranean Hackberry (Celtis australis) · roughly 100 to 200 years, judged from a trunk 2.9 m round · la Marina de Port
Barcelona protected twelve trees across the city in one sitting in May 2024, and this hackberry in the Jardins dels Drets Humans was one of them, cited for size rather than age: a 2.9 metre girth and a 20 metre crown, broad enough to shade a good stretch of the garden's paths.
It shares the garden with a much bigger, older-looking neighbour, a silky oak roughly 130 metres away, and together the two give the Human Rights garden two catalogued trees where most Barcelona parks have none. The garden itself is younger than either tree pretends to be: it opened to the public only in 2007, on land that had belonged to Philips' local factory since the 1960s, when a company landscape architect first laid the grounds out so workers could take their breaks outside.
Celtis australis is one of the most common street trees in the Mediterranean, tough enough for Barcelona's hot, dry summers and long prized for wood that bends without splitting, historically worked into whip handles and walking sticks. No planting date survives for this one. If you know it, the garden's own records do not.
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The Coast Coral Tree of Jardins de Mossen Costa i Llobera
Coast Coral Tree (Erythrina caffra) · Poble-sec, Montjuic
Barcelona's biggest cactus garden has one tree in it that is not a cactus at all: a coral tree from southern Africa, 3 metres round with a crown that spreads 20 metres wide, wide enough to shade a meaningful stretch of the six hectare garden by itself.
Erythrina caffra flowers before it leafs, bare branches erupting into thick orange-red spikes, a display gardens plant it for the world over. Barcelona added this specimen to its catalogue of trees of local interest in one sitting with eleven others in May 2024, protected for its size rather than any known age. Nobody has dated it.
The garden around it opened in 1970 on the seaward slope of Montjuic, named for the Mallorcan poet Miquel Costa i Llobera and built specifically to show off cacti and succulents from the world's dry regions, more than 800 species across terraces that step down toward the port. The coral tree stands out precisely because it does not belong to that theme, a broad-leaved African import in a garden otherwise devoted to spines. Free to enter, no gate, with one of the better views over Barcelona's harbour thrown in.
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The Tree Yucca of Jardins de Mossen Costa i Llobera
Tree Yucca (Yucca filifera) · Poble-sec, Montjuic
Most people who grow a yucca in their garden are growing something a few metres tall at most. Barcelona's tree yucca, on the seaward path below the steps up to Miramar on Montjuic, is 12 metres tall with a trunk 1.6 metres round, a genuinely tree-sized specimen of a plant most visitors assume tops out at shrub height.
Yucca filifera comes from the high desert plateaus of central Mexico, where old wild specimens branch into candelabra shapes and can outlive the people who planted their garden cousins many times over. Barcelona catalogued this one as a tree of local interest only in 2024, with no planting date recorded and no history beyond its own measurements.
It grows a short walk from an equally uncommon neighbour, an African coral tree in the cactus gardens above, on a stretch of path built specifically to show off plants that have no business surviving comfortably on a Mediterranean hillside. Nobody has confirmed how old this one actually is, or when it went in. If you know, the city's own catalogue does not.
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The Avocado of Teatre Lliure
Avocado (Persea americana) · 80 years · Poble-sec, Montjuic
An avocado tree does not usually end up on a list of remarkable urban trees, but Barcelona catalogued this one in 1996, and at roughly 80 years old and 13 metres tall it has outlived every use of the building beside it. That building opened as the Palau de l'Agricultura for the 1929 International Exposition, spent decades afterward as the city's central flower market, sat empty for years, and reopened in 2001 as the Teatre Lliure. The tree, planted around 1946 somewhere in the gap between exposition pavilion and flower market, is older than the theatre by 55 years.
Persea americana is native to central Mexico and normally grown for fruit rather than shade, which makes a mature specimen this size unusual in a European city: 1.6 metres round with a canopy 15 metres across, spreading well beyond what most people picture when they hear avocado tree. It stands on Placa Margarida Xirgu, in front of the theatre entrance, free to walk past whether or not anyone is seeing a show that night.
Nobody has recorded whether it still fruits.
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52
The Japanese Pagoda Tree of Carrer de la Guardia Urbana
Japanese Pagoda Tree (Styphnolobium japonicum) · Poble-sec, Montjuic
The Japanese pagoda tree is not from Japan. Styphnolobium japonicum is native to China, planted for centuries around Buddhist and Taoist temples there, and reached Europe under a name that stuck long after botanists sorted out the mistake. Barcelona's specimen on Carrer de la Guardia Urbana, a short walk from Montjuic's Greek Theatre, is 2.3 metres round and 20 metres tall, added to the city's catalogue of trees of local interest in 2024.
Its age is officially listed as under study, which is honest rather than evasive: the species can live for centuries in the right conditions, but nobody has aged this individual specimen, by ring count or by any other method. What earned it protection was size alone.
The tree flowers in late summer, cream white clusters that are one of the few genuine bursts of colour on Barcelona's streets in August, when most of the city's flowering trees have already finished for the year. It stands on an ordinary residential street in Poble-sec, no garden, no gate, nothing to mark it beyond the tree itself.
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53
The Castanyer Bord of Placa de Carles Buigas
Horse Chestnut (Aesculus hippocastanum) · about 89 years, from a planting around 1937 · Montjuic, Sants-Montjuic
The horse chestnut in Placa de Carles Buigas went into the ground around 1937, in the middle of the Spanish Civil War, in a city then still held by the Republic. Barcelona calls it a castanyer bord, or bastard chestnut, the old label for Aesculus hippocastanum: it looks like the sweet chestnut that gives Catalonia its autumn treat, but its conkers are bitter and inedible.
Catalogued as a tree of local interest in 1997, it has grown to 15.5 metres with a trunk 1.84 metres round and a crown spreading 11 metres, respectable rather than record-setting, which is exactly why the city keeps a list of local-interest trees at all: not every tree worth keeping is the biggest one in town.
The square takes its name from Carles Buigas, the engineer who built the Font Magica, Montjuic's musical fountain, right where this tree now stands. A visitor can watch the evening light show and stand under a tree not far off the fountain's own age.
No record we found says how freely it flowers each April compared with other horse chestnuts in the city; if you know, tell us.
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54
The Judas Trees of Placa Joanic
Judas Tree (Cercis siliquastrum) · about 70 years, planted in 1956 · Vila de Gracia
Barcelona calls this small grove at Placa Joanic 'the trees of love', and each April they make the case themselves: the whole crown erupts in magenta flowers that break straight out of the bark, trunk and branches both, before a single leaf shows. It is one of the few flowering habits dramatic enough that the city's own broadcaster runs a story most springs pointing readers toward wherever it is blooming that year.
The three trunks here, planted in 1956 in what is now Vila de Gracia, are old enough and large enough that Barcelona catalogued them as trees of local interest in 1996, unusual for a species that rarely reaches this size in the city. Their crowns spread up to 10 metres, and the widest trunk measures 1.65 metres round.
The Judas tree takes its English name from a legend that Judas Iscariot hanged himself from one; in the Mediterranean it is better known simply as the tree that turns a street corner purple every spring. This one gets noticed on schedule, in the second half of April, when Gracia's small square briefly does exactly that.
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55
The Hornbeam of the Sot de l'Estany
Hornbeam (Carpinus betulus) · about 80 years · Montjuic, Sants-Montjuic
Common hornbeam barely grows wild anywhere on the Iberian peninsula, which makes the specimen in Barcelona's Jardi Botanic Historic an outlier by definition. It has found the one pocket of the city cool and damp enough to suit it: the Sot de l'Estany, a shaded former quarry hollow that already holds four of Barcelona's officially monumental trees, a wingnut, two kinds of ash and a sycamore maple among them.
At roughly 80 years old the hornbeam is younger than those neighbours, which is why the city lists it one rank down, as a tree of local interest rather than a monument. It has still reached 18 metres with a crown 13 metres across, respectable for a species this far outside its natural range.
The garden was Barcelona's original botanical collection, on this same hill, before a newer one opened elsewhere on Montjuic. The ravine has kept its own microclimate ever since: cooler, wetter and stubbornly hospitable to trees with no business surviving this far south. Same ticket as the rest of the garden's veterans.
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56
The Osage Oranges of the Torre Girona Gardens
Osage Orange (Maclura pomifera) · Pedralbes, Les Corts
The city catalogued fourteen trees here as one. Osage oranges grow as a double row buried in the wooded part of the Torre Girona gardens, planted so long ago and grown so thoroughly into the surrounding vegetation that Barcelona's own tree register lists them under a single heritage number rather than fourteen separate entries, the same treatment it gives the garden's own stone pines a short walk away. The ajuntament's own record calls the species barely used today, with very few examples left anywhere in the city, which is what makes an old, unbothered row of them worth finding rather than an ordinary planting.
Maclura pomifera comes from the south-central United States, the Arkansas and Louisiana river country that gave the local Catalan name tarongers de Louisiana, Louisiana oranges, for the huge, wrinkled, inedible fruit that female trees carry. Osage Nation bowyers once prized its wood above every other American timber for its spring, which is where the tree gets its English name. In this garden it has spent its life doing nothing more dramatic than standing, on ground that went from a banker's private estate to a university campus with a supercomputer installed in its old chapel, and has been a public city park since April 2019.
Nobody has recorded when these went in. The register leaves the planting year blank, 'to be determined', still unresolved after a century of city cataloguing. If you know, the page welcomes the correction.
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