Hedgerows may be human-made, but there are few better habitats for wildlife – and they could play a major role in helping to reverse worrying biodiversity declines. Find out more about the amazing world of the hedgerow as we meet expert and author Christopher Hart.

Do you have a gardening question you'd like Alan Titchmarsh's help with? Submit your question in the comments below or go to www.gardenersworld.com/podcast/questions/

Alan will answer a selection in the Ask Alan podcast series from BBC Gardeners' World Magazine in February and March.

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