Peter Gibbs and the panel are in Sissinghurst Castle Gardens in the Weald of Kent for a correspondence edition. Pippa Greenwood, Matt Biggs and Chris Thorogood answer the questions raised by post, email and social media. The panellists advise on an unhappy Cypress tree, suggest container plants for a windy balcony and discuss the best time to dead-head roses. They also offer tips for a healthy crop of herbs in window boxes. Head Gardener, Michelle Cain, shows the panellists around the Sissinghurst Castle Gardens, stopping off to visit the White Garden, the Rose Garden and the Cottage Garden. Producer: Hannah Newton Assistant Producer: Rosie Merotra A Somethin' Else production for BBC Radio 4