To see one is to want several. The glamorous Agapanthus has striking, architectural foliage and, in late summer, produces stunning blue or white flowerheads on long, strong stems. A native South African that is equally at home on sunny London patios, the African lily is currently appearing in many guises, at Rassell's nursery in west London (020 7937 0481). Take your pick from three-foot, azure blue Agapanthus africanus, 12in dwarf variety Liliput, in deep blue, or white Agapanthus africanus Albus, which can reach a whopping 4ft, to name but three varieties. And just think, all they need is a roomy container filled with John Innes No 2. Prices start at £3.25 per plant.