RHS Chelsea Flower Show: Chelsea Flower Show 2012

SYNOPSIS

Alan Titchmarsh and Rachel de Thame discover how themes of water, boundaries and the British countryside are dominating the exhibits at this year's Chelsea Flower Show. Chris Beardshaw explores radical ideas for sustainable horticulture, last year's Best in Show winner Cleve West discusses topiary, and designer Jo Thompson reveals why her journey to build her garden began with a caravan. Continues tomorrow on BBC1 at 12.30pm.