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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.
'Lucy' is a cultivar that reaches 90cm in height. It flowers early, in late summer to early autumn, bearing sprays of anemone-style flowers with yellow centres and pale pink florets
A. thomsonii is a clump-forming perennial, to 1m tall, with oval, toothed leaves, up to 10cm long, on hairy stems. Flowerheads, up to 5cm across, comprising lavender-blue rays and a central yellow disk, are held on slender branches from late summer into autumn
'Claire Maxine' is most notable for its gleaming, puckered foliage, mid-green, reddening in winter. Flowers are deep pink but sometimes hidden beneath the leaves; flowers mostly in spring with sporadic flowers produced through to October
'Diana Clare' is a vigorous semi-evergreen perennial with narrow silvery-green leaves, lightly speckled with dark green near the margins, and violet-blue flowers from late winter to late spring
'Karneol' is an upright perennial to 1.2m tall, flowering in late summer and autumn, the flowerheads with spreading deep red ray florets surrounding a brown centre
'Orange Glow' forms a small clump of rounded, palmately lobed basal leaves, with deep yellow flowers 2-3cm wide, sitting above deeply divided green bracts and opening in late winter and early spring
'Hensol Harebell' is an erect herbaceous perennial to 90cm, with divided leaves tinted purple in late summer, and nodding, rich violet-blue flowers 5cm wide, with short, hooked spurs
'Genii' is an erect medium-sized deciduous shrub with yellow-green foliage. Flowers single, small, with narrow, up-curved cerise sepals, slender cerise tube and reddish-purple petals
'Cerro Potos?' is an evergreen shrub to 90cm tall, with neat, aromatic, light green leaves and and magenta-pink tubular flowers from mid summer to late autumn
'Fireworks' is a slowly clump-forming, non-invasive, cultivar. It flowers in late summer through to autumn. Its sprays of tiny yellow flowers are held in finer wands than many of its more densely-flowered relatives
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