Gardeners' Question Time

John Cushnie, Bob Flowerdew and Bunny Guinness answer some of the questions posed by gardeners in Lincolnshire. And in the third part of his series, leading tree expert Tony Russell shares his knowledge of spectacular trees with Peter Gibbs. The Gingko Biloba is as old as the dinosaurs but has shown a far greater ability to survive. Today it is recognised not only as an attractive tree, but an important source of medication and is tipped to become one of the most sought after trees in Britain.