Kathy Clugston is joined by Bob Flowerdew, Matthew Pottage and Christine Walkden to answer questions sent in via email and social media. This week, the panellists tackle questions from gardening enthusiasts on whether you can cut the top off a cactus, planting runner-beans upside-down and options for low-growing plants. Matt Biggs also advises on the best way to keep your lawn looking tip-top, and Bunny Guinness has this week's Gardening Glossary Producer: Daniel Cocker Assistant Producer: Jemima Rathbone A Somethin' Else production for BBC Radio 4