The prairies of North America inspire plans for perennials in Alan Titchmarsh 's garden. Reds and blues colour Gay Search's healing garden and Chris Beardshaw meets a couple whose cultivar collection is 220-strong.
Series producer Colette Foster ; Executive producer Tony Laryea (S) (W) WEBSITE: www.bbc.co.uk/gardening
BBC BOOK: Gardeners' World Complete Book of Gardening, price £12.99
A special garden party: page 34; Solar garden products: page 52