The Great Sycamore of Farmleigh
Castleknock, Phoenix Park
Approximate location.
Seasons1 of 4
The oldest tree on the Farmleigh estate predates the Guinness family who made the place famous by about a century. This sycamore, standing at the edge of what is still called the donkey field, is estimated at over 220 years old, meaning it was already mature when Edward Cecil Guinness bought Farmleigh in 1873 and began rebuilding the house around it. Everything else here, the cedars, the sequoias, the Thuja avenue Guinness planted along the main approach, arrived later as part of his deliberate planting scheme. The sycamore did not. It was simply already there, a survivor of whatever farmland stood on this ground before Farmleigh existed as a name. Today the house serves as the Irish state's official guesthouse for visiting dignitaries, but the 78 acres of grounds around it are free to the public every day, a rare arrangement for a working state property. Farmleigh's own visitor material points to this tree specifically as the oldest thing growing on the estate. No independent survey has verified that figure beyond the estate's own long-standing estimate, so it is presented here as tradition rather than a laboratory result.
From people who stood here
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Getting there
Farmleigh, Phoenix Park, Dublin 15
You can recognise it as the older, unplanned tree at the edge of the donkey field, apart from the estate's later cedars and sequoias. It stands on the Farmleigh grounds in Phoenix Park.
Free. Farmleigh grounds, gardens and gallery are open daily 10am to 6pm, last entry 5pm. The house itself is closed for the rest of 2026.
Dublin Bus route 37 to Castleknock Gate
In fruit
winged seeds that spin down in pairs
The line is our estimate of how much there is to see, not a measurement. Typical for this species where this tree stands; exact weeks shift with the year.
Sources
Where the facts on this page come from. The story was written with AI from these sources, and readers who know the tree correct it.