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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.
'Rotschwanz' is a rounded deciduous shrub with glossy dark green leaves that colour wine-red in autumn. Flattened lacecap flowerheads with large deep red, cross-shaped sterile flowers and fertile flowers of pink and white are produced in mid and late summer
'Enziandom' is a compact, rounded, deciduous shrub, to 1.2m high and wide, with dark green, broadly-ovate leaves that turn reddish-brown in the autumn. Large, long-lasting, rounded heads of deep gentian-blue flowers are borne in the summer
'Hamburg' is a bushy, rounded, deciduous shrub, to 1.2m tall and wide, with dark green, broadly-ovate, toothed leaves. The rounded flowerheads, borne in summer, are up to 20cm across and comprised of deep rose to purplish-blue florets, some of which have serrated sepals
'Belle Etoile' is a compact medium-sized deciduous shrub of arching growth with ovate leaves; highly-scented single white flowers to 5cm in width, tinged purple in the centre, in late spring and early summer
'Soeur Thérèse' is a rounded, bushy, deciduous shrub, to 1.5m tall, with ovate, serrated, dark green leaves. Large white flowerheads, up to 21cm in diameter, are borne from summer into autumn and each floret has a small blue eye. As the flowerhead ages, the colour fades to pale pink
'Nikko' is a compact and low-growing shrub 60cm tall, with narrowly lance-shaped leaves often turning deep purple in autumn, and racemes of small white flowers in spring and early summer
'Sybille' is a small, arching small deciduous shrub with ovate leaves and single, fragrant, creamy-white flowers 5cm in width, tinged purple in the centre
Tuff Stuff is a compact cultivar, to 90cm tall and wide, with mid- to dark green, ovate, serrated leaves that turn attractive shades of red and purple in the autumn. Lacecap flowerheads of pink or blue-purple ray florets with contrasting greenish-white eyes surrounding the fertile florets are borne from summer into autumn. This cultivar is noted for its tolerance of low temperatures and its ability to repeat flower on new wood
Perle d'Automne is a branching, deciduous shrub, to 1.8m tall, with ovate green leaves that turn shades of orange and red in autumn. Large, conical flower panicles are borne from summer into autumn and open pure white before maturing to a pale pink colour
'Phantom' is an upright to spreading plant, 145 x 195cm, with strong, stiff stems supporting large, very dense panicles, tapering above, rounded below. Leaves are yellow-green, stems green, maturing to mid-brown. Fertile florets are pale pink and white. Sterile florets white with some lime green flushing, deep pink at maturity
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