Trieste holds the densest cluster of registered monumental trees in Italy, 48 by the city's own count. Four stand within three hundred metres in the park an Austrian archduke laid out on a limestone headland, planting Californian conifers to see whether they would take. Four more grow in a public garden a botanist mayor planted himself and along the road climbing out of it. Three, a bagolaro and two elms, stand across Citta Vecchia and San Vito. A pair of Aleppo pines share a hillside park at Villa Revoltella, and the last stands alone at Opicina.
0 / 14 visités à Trieste
1
The Redwood of Miramare
Coast Redwood (Sequoia sempervirens) · about 170 years, planted after 1856 · Grignano
The man who planted this tree was shot by a firing squad in Mexico eleven years later. Archduke Maximilian of Habsburg began the Miramare park in the spring of 1856 on a limestone headland with almost no soil on it, and he treated the whole thing as an experiment: he wanted to find out which foreign species would hold on to bare Adriatic rock. Soil was carted in. Within ten years the garden had cedars from Lebanon, North Africa and the Himalaya, firs from Spain, cypresses from California and Mexico, and this coast redwood from the fog belt of northern California. Maximilian kept ordering plants for it after he sailed for Mexico to be crowned emperor, and he never came back. The redwood took. It is now 4.25 metres round the trunk and thirty metres tall, the largest of the two redwoods here and one of twelve protected trees standing within three hundred metres of each other. Put a hand on it. The bark is soft, dry and fibrous rather than hard, and on old trees it goes thirty centimetres deep, which is what lets a redwood walk out of a fire that kills everything around it. This one is a child by the standards of its species, which passes 115 metres at home.
Lire la suite et l’accès →
2
The Monterey Cypress of Miramare
Monterey Cypress (Cupressus macrocarpa) · about 170 years, planted after 1856 · Grignano
In the wild this species survives in two groves on the California coast, together covering less than a square kilometre, and it is listed as threatened. Planted anywhere else with sea air, it grows into one of the fastest and heaviest conifers a garden can hold. That is the paradox of the Monterey cypress, and this is what it looks like when it goes well: 4.1 metres round the trunk, eighteen metres tall, and far wider than it is high, because an old Monterey cypress stops climbing and starts spreading until the crown flattens out like a table. Maximilian's gardeners put it in after 1856 among the cypresses ordered from California and Mexico, and on a headland that gets the bora full in the face it has done the thing the archduke was testing for. The wind has pushed the whole crown away from the sea, so the tree leans its weight inland and reads as a permanent record of the direction the worst weather comes from. Crush a leaf between your fingers and it smells of lemon. The Italian sources describing the park call this simply the cypress, and one of them names the wrong species for it, so trust the trunk rather than the label.
Lire la suite et l’accès →
3
The Ghost Pine of Miramare
Ghost Pine (Pinus sabiniana) · about 170 years, planted after 1856 · Grignano
Trieste calls this one il pino fantasma, the ghost pine, and the name is a description rather than a flourish. Its needles are long, grey and set so thinly on the branch that you can see straight through the crown to the sky behind it, which no other pine in the park lets you do. Stand under it on a bright day and the tree casts almost no shadow. It comes from the dry foothills that ring California's Central Valley, where it grows on serpentine and rubble that defeats everything else, and it was one of the more eccentric things Maximilian's gardeners were given to try. Italy's register protects it on grounds of botanical rarity, a category only two trees in the whole Trieste list are given. The cones are the other reason to come. A ghost pine cone is the size of a human head, weighs up to a kilogram, and hangs on hooked scales that will draw blood if you grab one wrongly; the people who lived in its native range ate the seeds, which are large and oily and worth the trouble. At 2.5 metres round and twenty metres tall it is not the biggest tree here, and it is the strangest.
Lire la suite et l’accès →
4
The Greek Strawberry Tree of Miramare
Greek Strawberry Tree (Arbutus andrachne) · about 170 years, planted after 1856 · Grignano
This is a shrub that forgot to stop. Arbutus andrachne normally tops out as a thick bush on a Greek or Turkish hillside, and the Italian register lists this one at 2.04 metres round the trunk and twelve metres tall, which for the species is close to absurd. It is the reason the tree is protected on botanical rarity as well as on size. The bark is the thing to look at. Each summer the outer layer peels away in thin sheets like sunburn, and what is left underneath is a bare trunk the colour of cinnamon, cool and slightly waxy to touch, with no fissures anywhere on it. Run a hand along it and the surface feels closer to skin than to timber. Maximilian's gardeners planted it after 1856 among the Mediterranean species that were meant to prove the headland could hold a garden, and unlike the common strawberry tree it was never a safe bet this far north. Fifty-nine of its common cousins, Arbutus unedo, grow a couple of hundred metres away as a registered stand, and none of them has done what this one did. Its flowers come as small white bells in spring, its fruit as round orange berries.
Lire la suite et l’accès →
Photo : Andrea Adelfio (CC BY)
5
The Great Plane of the Giardino Pubblico
London Plane (Platanus x acerifolia) · about 180 years · Barriera Vecchia
The city dug up the pavement around this tree and threw it away. The Giardino Pubblico's biggest plane is 542 centimetres round the trunk and thirty-four metres tall, the largest tree in Trieste by measurement, and the paving laid over its root plate was slowly suffocating it, so the municipality broke the surface out and replaced it with draining material. That is what caring for a 180 year old tree in a city actually looks like. The garden around it was begun in 1854 by Muzio de Tommasini, a serious botanist who happened also to be the podesta of Trieste, on ground bought from Benedictine nuns after a plan to build a church and housing there was dropped. He planted the planes himself. Three hectares now hold roughly 320 large trees from five continents, arranged along paths lined with the bronze heads of Triestine writers, and Italo Svevo walked here often enough that the garden turns up in what he wrote. Nine planes in this garden are on Italy's monumental register and this is the heaviest of them. Stand back far enough to take in the whole trunk: the bark flakes off in plates and leaves the pale patchwork that is the only thing about a London plane you can identify from a hundred metres.
Lire la suite et l’accès →
6
The Twin Horse Chestnuts of the Giardino Pubblico
Horse Chestnut (Aesculus hippocastanum) · about 170 years, planted with the garden from 1854 · Barriera Vecchia
Two horse chestnuts stand thirty metres apart in this garden and the register measured both at exactly 335 centimetres of girth and exactly twenty-three metres of height. Identical to the centimetre, listed as two separate protected trees, and there is no way to tell from the paper which is which. They were almost certainly planted together when Muzio de Tommasini laid the garden out from 1854, and they have grown at the same rate for 170 years because nothing has happened to one that did not happen to the other. A third, slightly smaller at 317 centimetres, stands further north. Come in May. The horse chestnut is one of the few big trees that flowers in a way you notice from the other end of a park, holding hundreds of white candles upright on the ends of the branches, each one flecked with yellow that turns pink once the flower has been visited and no longer wants bees. The species itself is not from anywhere near here. It was unknown to western Europe until the sixteenth century and comes from a handful of mountain valleys in Albania and Greece, where it is now endangered in the wild.
Lire la suite et l’accès →
7
The Valonia Oak of the Giardino Pubblico
Valonia Oak (Quercus ithaburensis subsp. macrolepis) · about 170 years, planted with the garden from 1854 · Barriera Vecchia
This is the only valonia oak in Friuli Venezia Giulia, and it is the only tree on Trieste's entire monumental register protected for botanical rarity and nothing else. Every other entry earns its place on size, age or the look of the thing. This one is here because there is no second example within a region of 1.2 million people. At 179 centimetres round it is also one of the smallest trees on the list, which tells you how little the measurement matters in this case. The acorns are the reason the species was ever worth anything. A valonia acorn sits in a cup covered in thick shaggy scales that curl outward like a sea anemone, and those cups are extraordinarily rich in tannin. For centuries the eastern Mediterranean shipped them west by the boatload to tan leather, and the trade was large enough that the Greek and Turkish groves were managed for it. The species is semi-evergreen, holding tired leaves through mild winters and dropping them late. It grows wild in Greece, western Turkey and one wood in Puglia. Muzio de Tommasini, a botanist before he was a mayor, would have known exactly how unusual it was to put one in the ground here.
Lire la suite et l’accès →
8
The Plane of the Boschetto Roundabout
London Plane (Platanus x acerifolia) · over 200 years · Boschetto del Ferdinandeo
Trieste's oldest tree stands on a traffic roundabout. The municipality's survey of its 48 monumental trees puts this London plane above 200 years, which makes it older than every park in the city: older than the Giardino Pubblico begun in 1854 a kilometre downhill, older than the Miramare park begun in 1856, older than the Ferdinandeo villa on the slope above it. It was in the ground when Trieste was still Austria's only real seaport and the road it stands on was a country lane. It is five metres and ten centimetres round the trunk and twenty-five metres tall. The London plane was the tree of choice for the avenues and gardens Trieste built in the late eighteenth and early nineteenth centuries, which is why nearly a fifth of the city's protected trees are planes, and this is the survivor from the first of those plantings. A second registered plane stands twenty-five metres away, 440 centimetres round, and the two of them frame the entrance to the Boschetto del Ferdinandeo, the wooded hill that Triestini have walked up on Sunday afternoons for as long as the trees have been there. Take Via Giulia out of the public garden and keep climbing.
Lire la suite et l’accès →
9
The Bagolaro of Piazza Hortis
Mediterranean Hackberry (Celtis australis) · over 180 years · Citta Vecchia
For over 180 years this hackberry has stood in what is now Piazza Hortis, and for most of that time nobody thought about what people were doing to its roots. In 2025 the city fenced it off: pedestrians had been crossing the square for generations without knowing they were walking on top of nearly two centuries of root plate, compacting the soil the tree breathes through. The comune spent about 17,000 euros on the fence and on new drainage-friendly planting around the base, part of a wider programme that has already stripped suffocating pavement away from monumental trees elsewhere in the city.
Trieste has identified 48 monumental trees within its borders, the highest concentration the comune has recorded of any Italian city, and this bagolaro is one of them. In September 2024 it was fitted with a TreeTag, a small ID marker placed as part of a European citizen-science campaign that measures a tree's condition and records the data for researchers to track over time.
Celtis australis is native across the Mediterranean and famously slow to give up: its wood was used for cart axles and ploughshares because it resists splitting even when green. This one has outlived the square's own name twice over, and the piazza, library and street around it are all named for Attilio Hortis, the Trieste historian and librarian who died a century ago.
Lire la suite et l’accès →
10
The Siberian Elm of Piazzale Rosmini
Siberian Elm (Ulmus pumila) · not individually documented · San Vito
The garden at Piazzale Rosmini climbs the San Vito hill above the church of Madonna del Mare, nine and a half thousand square metres of slope and lawn that the city's own parks department singles out for two things: its valuable trees and its play areas for children of different ages. The Siberian elm growing there, 3.58 metres round and 24 metres tall, is one of Trieste's registered monumental specimens and the garden's standout tree.
Ulmus pumila earned its place in European gardens for the same reason it earns a mention here: it shrugs off Dutch elm disease far better than the native field and wych elms the fungus devastated across the continent from the 1970s onward. A healthy elm of real size in a European city is worth noticing partly for that reason alone, a survivor by constitution rather than by luck.
Like the bagolaro at Piazza Hortis, this elm was fitted with a TreeTag in September 2024, part of the same citywide EU citizen-science campaign that is slowly building a public record of condition and growth for Trieste's 48 monumental trees. No individual age has been published for it, so none is claimed here.
Lire la suite et l’accès →
11
The Aleppo Pine of Villa Revoltella
Aleppo Pine (Pinus halepensis) · not individually documented · Villa Revoltella
The park came with a condition attached to it. Pasquale Revoltella left his grounds above Via Fabio Severo to the city of Trieste on the terms that they stay free and stay open, and five hectares of hillside are still a municipal garden that charges nobody anything and unlocks its gates at seven in the morning. A national parks and gardens competition later voted it the most beautiful park in Italy.
Two Aleppo pines inside it hold Italy's monumental-tree protection, standing about fifty metres apart. This is the thicker of the pair and the shorter, 360 centimetres round the trunk and eighteen metres tall, where its neighbour is slimmer and carries four metres more height. Pinus halepensis is the pine of the dry Mediterranean, the species that takes bare limestone where nothing else will hold on, and the karst Trieste sits on is exactly that ground. Its cones are small, hard and slow, sitting closed on the branch for years at a time.
Nobody has put a number of years on either tree. The regional register measured this one in 2025 and left the age column empty, Il Piccolo photographed a monumental Aleppo pine here in 2018 without dating it, and girth on its own will not settle the question for this species in this climate. If you know of a figure with a real basis behind it, tell us.
Lire la suite et l’accès →
12
The Second Aleppo Pine of Villa Revoltella
Aleppo Pine (Pinus halepensis) · not individually documented · Villa Revoltella
Trieste keeps a plan for the day its biggest trees come down. Seventy-eight of them were surveyed one at a time for the risk of failure, and this pine is on that list, entered as a trunk 110 centimetres across in the park at Villa Revoltella. Convert it and you get 346 centimetres round, which is what the regional register measured here, and fourteen centimetres less than the other protected Aleppo pine standing fifty metres away. Two pines, two sets of figures. That arithmetic is the only thing proving this hillside holds a pair rather than one tree counted twice.
This is the taller of them by four metres, twenty-two to the top, and the slimmer. Pinus halepensis does not grow to order: it leans, forks low and carries its needles in loose tufts at the ends of long bare limbs, so an old one reads as an open, see-through tree rather than a column, and a slope exaggerates the habit further. The register protected it on size and on the character of the stand it belongs to.
What the register gave no answer to is how old it is, and neither does anything else published about this park. A dated planting record for the Revoltella grounds would settle both pines at once, and somebody in Trieste may well have one.
Lire la suite et l’accès →
13
The Caucasian Elm of Villa Sartorio
Caucasian Elm (Zelkova carpinifolia) · not individually documented · Citta Vecchia
Italy's monumental-tree register holds this elm twice. One sheet calls it the tree of Villa Sartorio on Via dei Modiano and gives 353 centimetres of girth and 23 metres of height; another calls it the tree of the Giardino Sartorio and gives 350 and 20. The two records sit forty-three metres apart, which is the width of a garden rather than the distance between two trees, and every independent account of the place, the newspaper's, the museum's and the city's, describes exactly one Caucasian elm here. One tree, two files. It is also why the pin on this page is marked approximate: nobody can say which of the two readings lands closer to the trunk.
The Comune di Trieste owns only four monumental trees outright, and this is one of them. In 2026 all four went into a municipal programme of roughly 135,000 euros for survey and selective pruning, this elm alongside the two great planes of the Giardino Pubblico.
Zelkova carpinifolia comes from the Caucasus and the Caspian forests of northern Iran and reached European gardens in the eighteenth century. It is not a true elm, whatever the name says. Its leaves are small and evenly toothed, nearer a hornbeam's than an elm's, which is exactly what carpinifolia means. Nobody has published an age for it, so we offer none; if you know when it went into this garden, tell us.
Lire la suite et l’accès →
14
The Horse Chestnut of Via Nazionale
Horse Chestnut (Aesculus hippocastanum) · not documented · Opicina
Trieste's protected trees stand in designed grounds: a Habsburg's experimental headland, the public garden a botanist mayor laid out, the wooded hill above it. This one stands on a state road. The horse chestnut at Via Nazionale 51 grows up on the karst plateau at Opicina, a tram ride out of Piazza Oberdan, with the SR58 running past it and a footway in between.
It is 324 centimetres round and fifteen metres tall, and the honest thing to say next is that we know nothing else about it. Neither of Il Piccolo's surveys of the city's old trees mentions an Opicina chestnut. No age has ever been published. The only document that names it is the protection order itself, issued nationally and republished by the region, which is one source wearing two covers rather than two sources. The frontage is public and has a pavement along it; whether the trunk itself sits just inside a gate at number 51 is the one thing we could not settle from here.
Come in May. A horse chestnut in flower holds hundreds of white spikes upright at once and reads as a flowering tree from the far end of the street. By August most European ones are going brown, from a leaf-mining moth that crossed the continent in the 1990s, and the walk is worth less. If anybody up there knows this tree's age, or owns a tape measure, we would like to hear it.
Lire la suite et l’accès →