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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.
'Gallery Pablo' is a compact plant to 50cm, with light coral-red flowerheads, the florets shading to apricot-yellow towards the base
'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
A. altissima is a tall herbaceous perennial to about 1.7m with brown stems and grey-green, nettle like leaves. Umbel-like clusters of small, white, long-lived flowers appear in summer and early autumn
'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
'Ms Mars Improved' is a compact, branching annual to 60cm tall with purple-flushed, oval to heart-shaped leaves. Flowers up to 15cm across borne from summer into early autumn have very dark centres surrounded by deep pink-red petals the outer tips of which are cream coloured
Blossom of Snow 'Berghman' is a perennial to 20cm in height or more, with narrow, grey-green leaves and prolific, large heads of yellowish-white flowers surrounded by star-shaped white bracts in late spring and early summer
Chrysanthemum are erect woody-based perennials with aromatic, pinnately lobed leaves and flowerheads of diverse form, from late summer to late autumn 'Tapestry Rose' is a bushy, deciduous perennial to around 80cm tall. Single, rich rose-pink flowerheads to 4cm in diameter with greenish-yellow centres are produced in 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
E. ritro is a robust, upright herbaceous perennial, with jaggedy-divided, prickly dark green leaves whitish beneath. Rounded, violet-blue flower heads on silvery, branched, leafy stems
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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.