Cardiff's four mapped trees answer to very different kinds of proof. The Maiden Oak of St Fagans, never pollarded, has stood on the museum's grounds for an estimated 180 to 350 years, dated only by its girth. A sweet chestnut sat unrecorded in Bute Park until volunteers taped it in 2023, and a London plane nearby carries its own Glamorgan Champion title, 612 centimetres round. The fourth is younger and different in kind: a tree planted in 1985 for Raoul Wallenberg, the diplomat who saved thousands of lives in Budapest and vanished into Soviet custody.
0 of 4 visited in Cardiff
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The Raoul Wallenberg Tree
species not established · planted 1985 · Cathays Park
Cardiff's memorial to a man who saved tens of thousands of lives is alive itself. It was planted in 1985 for Raoul Wallenberg, the Swedish diplomat who spent the last months of 1944 in Budapest issuing protective passports and running safe houses that kept Hungarian Jews off the deportation trains. In January 1945 Soviet forces took him into custody. He was never seen again, and what happened to him has never been established.
The tree stands in Alexandra Gardens in Cathays Park, the formal green rectangle at the centre of Cardiff's civic quarter, where the Welsh National War Memorial and a row of other monuments face each other across the grass. A plaque at its foot carries his name. Most of what is commemorated in that garden is carved; this is the one that has put on forty years of growth since it was dedicated.
It is young by the standards of this map, and it is here for what it stands for rather than for its age. Two things about it are still open. Nobody has recorded which species it is, and no source places it more precisely than the garden. Alexandra Gardens is small enough that you will find a young tree with a Wallenberg plaque without much hunting. If you get there and can name the species, tell us and we will put it on the page.
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2
The Bute Park Sweet Chestnut
Sweet Chestnut (Castanea sativa) · veteran tree, exact age not documented · Bute Park
Bute Park holds more than 3,000 catalogued trees and 50 British champions, and it took until 2023 for anyone to formally record this sweet chestnut as a veteran. Volunteers from Coed Caerdydd and Coed Cadw, the Woodland Trust in Wales, measured it during Ancient Tree Inventory training days that year, with park staff member Nigel Pugh running the tape around the trunk: 4.7 metres. One of the most thoroughly surveyed municipal parks in Britain had a tree that size sitting outside its own records.
Sweet chestnut is not a British native. It came from the Mediterranean and went into estate grounds for its nuts, its timber and its looks, and old ones give themselves away: the bark twists into long spirals up the trunk as the tree ages, so a veteran looks as though someone has wrung it out. This one grows in the park immediately behind Cardiff Castle, free and open daily, on ground the city has had the run of for generations.
Two things we cannot give you. Nobody has dated it, so its age is not estimated but simply unrecorded, and the 4.7 metres remains the only hard number published about it. And nobody has said where in the park's 56 hectares it stands, so the pin marks the park rather than the trunk. If you find it, tell us where it is.
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3
The Maiden Oak of St Fagans
Oak (Quercus, species not established -- likely Pedunculate Oak, Quercus robur, common in this region, not confirmed by a source) · several hundred years, estimated from girth · St Fagans
Most of Britain's big old oaks were worked for a living. They were pollarded for firewood or cut back for fence posts, which squatted them and, as it turned out, kept them alive for centuries. This one was left alone. A maiden oak has never been cut, so what you get is the tree's own natural shape on a single trunk, and this trunk now measures 5.38 metres round on the grounds of St Fagans National Museum of History, on the western edge of Cardiff.
Nobody has dated it. Put the girth through the usual rough growth rate for an open-grown oak, somewhere between one and a half and three centimetres of girth a year, and you get a band of roughly 180 to 350 years, which is as close as honesty gets without a corer. That puts its first decades somewhere between the reign of Charles II and the early years of Victoria's, and it means the tree was already standing well before the museum was.
Volunteers surveying Cardiff's ancient and veteran trees in 2023 updated its record rather than opening one, so the inventories already knew about it. It stands among the farmhouses, chapels and cottages that St Fagans has moved here piece by piece from across Wales and rebuilt. The grounds are free. Nobody has published where in the 100 acres it stands, so allow time for the hunt.
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4
The Blackfriars Champion Plane
London Plane (Platanus x acerifolia) · roughly 255 to 310 years, derived from girth (measured 2022) · Bute Park
Bute Park has fifty British-champion trees and more than 3,000 catalogued specimens, and this London plane earned its own designation in 2022: Glamorgan Champion, the largest of its kind recorded in the county. It stands at the south east edge of the Blackfriars site, where a medieval friary once stood before the Bute family's landscaping buried its footprint under lawn.
The tree measures 612 centimetres round and 24 metres tall. Working backward from that girth using the standard method for estimating veteran trees in Britain, its age comes out at roughly 251 years on a good growing site or 307 on an average one, which would put its planting between 1715 and 1771. Either way it predates Andrew Pettigrew, who took up his post as head gardener to the third Marquis of Bute in 1873 and planted the avenues seen in the park today; nobody has found a record of who planted this one or when.
The date range reaches back to the mid eighteenth century, when the first Marquis employed Capability Brown to landscape the Castle Green nearby, and Cardiff's own parks record says London planes near Blackfriars may date from that work. No source ties this specific tree to Brown by name, so treat the connection as circumstantial rather than settled.
A blue plaque on the Champion Tree Trail marks it in the park.
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