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Stanage Edge in Derbyshire is a bleak moorland landscape with poorly drained soil that makes it very boggy. Alan Titchmarsh looks at clumps of cotton grass that break up the great swathes of heather and bracken. But when he looks closer he finds sundew, their rounded leaves covered in hairs exuding a sticky goo. Sundews use the goo to catch insects to supplement their diet, and just one insect will keep a sundew going for months.