Gardeners' Question Time

John Cushnie, Bob Flowerdew and Peter Seabrook answer some of the questions posed by gardeners in Essex. In the fourth part of his series, leading tree expert Tony Russell shares his knowledge of spectacular trees with Peter Gibbs. He debunks the myths about the misunderstood medlar - its resistance to pests and diseases, compact habit and delicious fruit make it a perfect tree for the small garden.