Frances Tophill visits the Royal Botanic Garden Edinburgh. With the historic glasshouses currently undergoing renovation, she finds out how staff are managing to move and care for such a vast and vital collection - when they've got the builders in. Carol Klein takes a sensory stroll through the gardens of Goldstone Hall in Shropshire, and Nick Bailey visits Thorp Perrow Arboretum, in North Yorkshire, to see the National Collection of Cotinus - one of the best shrubs for autumn colour
