Why do gardens need compost? What exactly is compost and what are the benefits compost brings to our gardening spaces? Charles Dowdling, gardener, author and champion of the modern 'no dig' gardening method, brings ways you can transfer your garden through the use of compost.

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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