The team at RHS Garden Wisley give their expert advice on protecting your plants from winter weather, including: • A guide to frost protection for dahlias and tree ferns • To dig or not to dig? How to prepare your soil to give next year's vegetables a head start • Autumn house plant care The RHS Advisory Service answers your latest gardening queries and we have the latest news on events in October across all four RHS Gardens at Harlow Carr, Hyde Hall, Rosemoor and Wisley