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John Cushnie, Bob Flowerdew and Bunny Guinness answer some of the questions posed by gardeners in Lancashire.

And in the final part of his series, leading tree expert Tony Russell shares his knowledge of spectacular trees with Peter Gibbs.

The Rowan tree forms an important part of Celtic folklore, although as many seem to see it as a force for good as for evil. This native British tree is a great survivor and is ideal for a modern garden, being tolerant of atmospheric pollution, soil types and disease resistant.