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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.
A. mollis is a vigorous plant with large, glossy dark green leaves, pinnately lobed and, in late summer, tall racemes of white flowers with dusky purple bracts
A. spinosus is a handsome herbaceous perennial to 1.2m, with large, deeply lobed and spine-tipped, dark glossy green leaves. Erect spikes of white flowers with spiny purplish bracts in late spring and summer
A. circinatum is a spreading bushy small tree or large shrub with rounded, 7 to 9-lobed leaves turning red or orange in autumn. Clusters of small purplish flowers are followed by red-winged fruits
'Nigrum' is a deciduous shrub or small tree with 5- to 7-lobed leaves, deep purple in spring and summer, becoming crimson in autumn
'Dissectum Atropurpureum' is a slow-growing shrub of broadly arching habit, with deep purple, lobed and finely toothed leaves turning orange in autumn
'Garnet' is a medium-sized deciduous shrub. Leaves with usually seven deeply dissected lobes, deep brownish-red throughout summer, slightly brighter in autumn. Small purplish flowers are followed by red fruits
A. inapertus is a clump-forming herbaceous perennial 90-150cm or more highwith deciduous, rather upright, strap-shaped leaves, up to 70cm long and 2-3cm across, and stiff, upright stems topped by umbels, 10-15cm across, of hanging flowers, 2.5-4cm long, in late summer and early autumn; the flowers are in shades of blue, often purplish and sometimes very dark in colour, and are tubular with the segments barely open at the mouth
A. quinata is a climber with bright green leaves composed of five elliptic or obovate leaflets notched at the tips. Fragrant reddish-purple flowers, with larger females at the base of the raceme, are sometimes followed by purple fruits up to 10cm in length
A. trifoliata is a strong-growing climber with leaves composed of three ovate, slightly lobed leaflets which are often bronze-tinted when young, and deep purple flowers in short racemes, followed by light purple fruits
A. ampeloprasum blooms in summer with spherical umbels of small, tightly-packed, pale purple flowers. Height to around 1m
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