Gardeners" Question Time

Peter Gibbs takes a look through the GQT archives for top tips on sustainable gardening.Over the years the GQT panellists have shared plenty of knowledge on how to be a green gardener. They look at everything from how to make your driveway more environmentally friendly, to efficiently collecting rainwater at home.We also hear Hafsah Haferji's "how-to" on companion planting, and head back to RHS Wisley with Matthew Pottage and Environmental Researcher Tijana Blanusa to learn how trees help us with

Peter Gibbs and the team are at Herstmonceux Castle, East Sussex. Juliet Sargeant, Matt Biggs and Matthew Pottage are this weeks' panellists, ready to answer your gardening questions.Led by Herstmonceux's head gardener Guy Lucas, the team explores the castle grounds and learns about the sustainable gardening practices adopted in recent years.The panellists also tackle questions from listeners, including suggestions for what to plant around a thatched cottage, and when to prune plants that are still