In the last of his current series celebrating Clever Trees Richard Uridge visits the National Arboretum at Westonbirt in Gloucestershire, England – with 18,000 specimens a veritable tree university – and talks to the trees.

In the fourth of his programmes on Clever Trees Richard Uridge visits the Lost Gardens of Heligan in Cornwall, England, where he finds a relative of the culinary bay that’s so potent it can give you a headache and another trees that’s smart enough to provide the cure.

Richard Uridge travels to tropical Far North Queensland in Australia to meet a tree that it's claimed can create its own rainfall to cope with drought conditions. The third in a series of five podcasts from around the world examining arboreal intelligence.

Richard Uridge travels to George Washington's home at Mount Vernon in America to meet two holly trees conjoined at the trunk. The first in a series of five podcasts from around the world.

Richard Uridge travels to the Malaysian jungle in search of a tree so clever it can tell the time. Or at least that's what he's been told. So armed with a wristwatch he puts the theory to the test. The second in a series of five podcasts from around the world examining arboreal intelligence.