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Britain’s oldest tree appears to be undergoing a sex change.
The Fortingall Yew in Perthshire, which estimates suggest is between 3,000 and 5,000 years old, is regarded as a male tree because of the fact it produces pollen – unlike female yews, which produce distinctive seed-bearing red berries.
But botanists have spoken of their surprise after finding three red berries on a branch of the yew this year – in signs at least part of the male tree is becoming female.
The seeds have been collected and will be included in a major project to “conserve the genetic diversity of yew trees” Photo: HEMEDIA
Dr Max Coleman, of the Royal Botanic Garden Edinburgh, who spotted the berries, said: “Yews are normally either male or female and in autumn and winter sexing yews is generally easy.
“Males have small spherical structures that release clouds of pollen when they mature. Females hold bright red berries from autumn into winter.
“It was, therefore, quite a surprise to me to find a group of three ripe red berries on the Fortingall Yew this October when the rest of the tree was clearly male.”
The Yew tree in Fortingall is thought to be the oldest tree in Europe Photo: Alamy
Dr Coleman said while it may seem “odd”, it was not unheard of for yews – and other conifers that have different sexes – to switch sex.
He said: “Normally this switch occurs on part of the crown rather than the entire tree changing sex.
“In the Fortingall Yew it seems that one small branch in the outer part of the crown has switched and now behaves as female.”
It is not unusual for for yews to switch sex Photo: Alamy
He said the three seeds had been collected and would be included in a major project to “conserve the genetic diversity of yew trees” by planting them out at the Botanic Garden.
“The Fortingall Yew itself will be represented in the hedge and so too, all being well, will its offspring, via the curious ability of yew trees to change sex,” he said.
The partial transition of the Fortingall Yew is likely to generate further interest in the tree, which Dr Coleman said was already “a tree of international renown as potentially the oldest individual tree in Europe” – although its precise age is contested.
Writing in a blog, Dr Coleman lamented the fact that the tree was “surrounded by a small enclosure built of stone with sections of iron railings giving glimpses of the ancient hulk within”, making visiting it “reminiscent of a trip to the zoo”.
“This unfortunate state of affairs came about as a way of putting off unscrupulous souvenir hunters who would help themselves to parts of the tree,” he said.