White Garden. Chris Beardshaw takes to the air in a flurry of snow, heading for Edinburgh and the Scottish mountains beyond. Visiting Mar Lodge and Crathes Castle, he hunts for plants capable of surviving harsh conditions. Juniper, heather and black snake grass are among his finds. Director Peter Leonard ; Series producer Kathy Myers www.bbc.co.uk/gardening BBC MAGAZINES: Gardens Illustrated, £3.50; Gardeners World. £2.60