Leaves are green, right? Wrong! Curator Matt Pottage shares the reds, oranges, yellows and even shocking pinks to be found among the spring foliage at RHS Garden Wisley. Chris talks to writer and broadcaster Jane Perrone about a life-changing gardening project at Yarl's Wood Immigration Removal Centre near Bedford. This month's plant rant is the often-maligned bergenia. Garden writer Melissa Mabbitt and Deputy Editor Phil Clayton share the good and the bad, and give suggestions of the best varieties and how to use them.