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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.
'Blue Eclipse' is a medium-sized deciduous climber, up to 3 metres high, with divided green leaves and large bell-like flowers of deep blue with a white edge on the outside and white inside, followed by fluffy seedheads
'Subpumilum' is a compact deciduous fern to 10cm tall, with glossy black stalks bearing pedately divided fronds composed of fresh green, close-packed oblong segments
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
'Gerda' is a deciduous shrub or small tree, with deep purple foliage from spring to autumn and flat heads of small, pinkish-purple flowers, followed by purple-black berries
'Ashby' is a bushy plant growing to 90cm tall and wide at maturity. The lobed, scented leaves are mid- to dark-green and flowers are a pink-purple colour with dark central markings on the upper petals
'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
N. mutabilis is an upright annual to 1.5m tall with a basal rosette of large, oval leaves. In summer, airy clouds of trumpet-shaped flowers are borne on branching stems changing colour as they age from white through shades of pink
'Tsatsumi Gold' is a slow-growing coniferous shrub, to 2m tall, with a rounded habit that gradually becomes broadly-columnar as the plant ages. Its branches and branchlets are twisted and contorted and densely-covered with small scale-like leaves. Young foliage is bright yellow, becoming yellow-green in summer before taking on golden-yellow tones in autumn and winter
'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
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