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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. sphaerocephalon is a tall perennial with a tuft of narrow basal leaves to 30cm long, and long-stalked, dense, rounded heads of pink or reddish-brown flowers in summer
A. glutinosa is a deciduous tree to 25m, broadly conical in habit when young, with grey-purple buds and young catkins conspicuous in winter, and rounded bright green leaves
A. incana is a conical tree, to 20m, with dark-green leaves to 10cm long, grey-white and hairy beneath. Yellow-brown male catkins in pendent clusters of 3 or 4 are produced in late winter or early spring, before the leaves. Ovoid fruit is produced in summer
A. consanguineum is a tall, tuberous perennial producing a single, umbrella-shaped leaf with 11-20 leaflets 20cm or more in length, on a stem up to a metre high. Below this, in summer, is the dark, purple-brown hooded spathe marked with fine green and white stripes. Striking, bright red berries appear in autumn
A. proboscideum is a rhizomatous perennial producing mats of arrow-shaped, glossy, green leaves up to 15cm long. The flowers appear in spring; a dark purple-brown spathe with a long narrow tip, like a mouse's tail, and a white base
A. littoralis is an evergreen climber with twining stems bearing broadly heart-shaped, greyish leaves and curiously shaped, brownish-purple flowers 10cm long, heavily veined with creamy-white
A. triloba is a shrub or small tree with oval leaves up to 30cm long, turning yellow in autumn. Purple-brown, cup-shaped flowers up to 5cm across are produced in late spring, followed by egg-shaped, edible fruit up to 12 cm long, yellow-green at first, ripening to yellow-brown
A. elatior is an evergreen rhizomatous perennial to 60cm, with glossy dark green, leathery, lance-shaped leaves and inconspicuous dull brownish-cream flowers borne at soil level in early summer
B. ermanii is a medium-sized tree, sometimes multi-stemmed, with peeling cream bark on the trunk, papery brown bark on the branches; coarsely toothed, ovate leaves turn yellow in autumn; male catkins open with the leaves
B. grossa is conical in outline, with reddish-grey bark becoming dark grey with age. The dark green leaves are up to 10cm long and turn golden-yellow in autumn. The shoots are aromatic, and carry long, yellow-brown, male catkins in early spring
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