Eric Robson chairs the popular horticultural forum.
John Cushnie, Chris Beardshaw and Bunny Guinness answer questions posed by gardeners in the Peak District.
The forensic unit at the Royal Botanical Gardens, Kew, has been key in solving a large number of crimes, including murder. Anne Swithinbank and Matthew Biggs visit and discover the secrets of the Jodrell Laboratory.
Including the Gardeners' Question Time gardening weather forecast.
A Taylor Made production for BBC Radio 4.