Young ignorant of native trees
Less than half of British under-25s know conkers come from horse chestnut trees, compared to nearly 90 per cent of over-55s.
One fifth of youngsters also thought acorns come from a willow tree and one in six believed that there is an acorn tree, research in support of British Tree Week revealed.
But the majority of Brits (57 per cent) did manage to spot an oak tree, from which acorns fall.
The older generation (over-55s) were more tree-savvy with three quarters understanding the term "deciduous" - referring to trees that shed their leaves seasonally.
Less than a quarter of under-25s recognised the term.
Gary King, marketing manager at Bosch Lawn and Garden, who launch British Tree Week on Monday, said: "Our research shows that a quarter of us can't even name the trees in our own garden which is a real shame.
"We want to help shine a light on our native varieties and motivate people to learn how to care for and look after their own trees."
Four out of five people couldn't recognise the leaves of an ash tree and three quarters were unable to identify those of a beech tree.
People from Norwich knew the most about trees, followed the people of Leeds and Southampton. Glaswegians were the least knowledgeable when it came to trees.
In the survey, 1,000 British people were questioned on their knowledge of trees.