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 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.