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All ratings refer to the UK growing conditions unless otherwise stated. Minimum
temperature ranges (in degrees C) are shown in brackets
AGM plants have been through a rigorous trial and assessment programme. They are:
This plant will provide nectar and pollen for bees and the many other types of pollinating insects.
It is included in an evolving list of plants carefully researched and chosen by RHS experts. Divided into 3 groups these lists, linked below, are maintained by a team of RHS staff and are reviewed annually.
'Night Star' is a compact plant to 30cm tall, with grey foliage and single flowers 3cm across. Petals broad, with toothed edges, deep red-purple with rich pink margin and blotches
'Becky Towe' is an upright herbaceous perennial with bright pink, mauve-eyed flowers set against green and cream variegated foliage
'Eileen Postle' is a compact plant to 30cm in height, with cerise flowers 6cm across, the upper petals dark-veined
'Daydawn' is a spreading, bushy deciduous shrub to 80cm tall, with small, pinnate leaves and saucer-shaped pale yellow flowers tinged yellow and pink, from early summer to early autumn
'Whirling Butterflies' is an upright herbaceous perennial to about 80cm, producing airy spires of delicate white flowers with long white stamens, opening from pink buds over a long period from late spring to early autumn
'Fire Dance' is a selection of this rounded evergreen shrub with deep reddish-purple leaves, which may green in summer, and bright pink, slightly fragrant flowers from early spring. May be smaller-growing than the species, often to 1m in height and width
Rosais is a bushy plant to 30cm with bold foliage and trailing stems to 50cm; semi-double rosy-pink flowers with purple markings on lower petals
Amber is a moderately-vigorous climber with double, nodding flowers composed of ribbed tepals, varying from amber to creamy-yellow, and tinged pink on the back of the petals. Flowering in late spring and early summer then again in early autumn; profuse seedheads follow
'Karfunkelstein' has fleshy, green-blue leaves with a purple tint in spring.This becomes more pronounced as they mature until they turn almost beetroot-purple. The bright pink flowers emerge in tight clusters late in the summer. Flowerheads stay on the plant for many months, although their colour will fade, providing structure in the winter garden
A. albus is a perennial forming a dense clump of linear leaves, with pink-veined white flowers to 4cm across in simple or branched racemes in late spring
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We're a UK charity established to share the best in gardening. We want to enrich everyone's life through plants, and make the UK a greener and more beautiful place.