This month Mark Diacono continues his series championing growing for taste with a look at our spiky friend, the gooseberry. Chris talks to him about how best to cook them, and why they've fallen out of fashion. Meanwhile, Emily Erlam, the designer of a London roof garden gives tips on how to create your own lofty paradise. Plus we talk to Catherine Dawson, the Technical Director at Melcourt Industries, about going peat free, and the innovations that promise to reduce the environmental cost of horticulture.