How do I make my cactus healthier? Which 1930’s style plants could I grow indoors? How do I prune mistletoe? Peter Gibbs and his panel of horticultural experts are at Cambridge University Botanic Gardens for this week’s postbag episode of Gardeners’ Question Time. Joining Peter on a tour of the gardens are Head Gardener of Horatio’s Garden Ashley Edwards, ethnobotanist James Wong, and garden designer Bunny Guinness. Alongside the questions, the Head of Horticulture at Cambridge University Botanic Gardens, Sally Petitt, gives the pane a tour of the greenhouses and gardens on the historic site. Producer: Dominic Tyerman Assistant Producer: Dulcie Whadcock A Somethin' Else production for BBC Radio 4.