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in April or May, or after the last frosts.AdamMake sure that you protect the entire plant, leaving no gaps, to avoid exposure to cold air and frosts.More advice on caring for plantsSarah Raven shows how to check your bananas for frost damage.Insulate your

staging or a dry shed.AdamIf your dahlias are in a warm, sheltered spot in the border and you don't want to lift them, add a thick layer of mulch for extra insulation in winter.Caring for your dahliasVideo guide to taking dahlia cuttings, with Sarah Raven

to protect the growing point. In cold regions this can be loosely packed with straw for extra insulation.Push bamboo canes into the ground around the plant to be protected, and cover with horticultural fleece or bubble polythene to create a protective tent