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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.
'Erecta' is a very tall and vigorous, fastigiate form of the aspen, thought to originate from Sweden. Its rustling leaves show good autumn colour. Male catkins are borne in spring
'Aurea' is a vigorous, large deciduous tree to 25m or more, of broadly conical habit. Leaves ovate, bright golden-yellow in early summer, becoming greener in summer, but giving good yellow autumn colour
'Purple Tower' is a fast-growing, upright, deciduous tree that may ultimately reach 30m but can be kept smaller with annual pruning. The glossy, triangular foliage is rich, bronzy red-purple and balsam-scented when young. Red male or green female catkins are produced by mature trees in early spring
P. tremula is a large deciduous tree with a broad crown, sometimes suckering freely. Rounded leaves, bronze when young, tremble in a light breeze and turn yellow in autumn. Male trees have woolly grey catkins
P. lasiocarpa is a large deciduous tree to 20m tall, the handsome ovate leaves up to 30cm long, with conspicuous crimson stalks and midribs. Yellow male, or green female catkins to 25cm long open in spring
'Italica' is a large, vigorous, narrowly columnar deciduous tree to 30m tall, with bright green ovate leaves and crimson male catkins before the leaves open in early spring
P. alba is a spreading, deciduous tree with a broad crown, suckering freely. Rounded leaves are deeply-lobed, dark green on top and white and downy underneath. Young shoots and leaves are completely white and hairy; yellow autumn colour. In spring, male catkins are red and female, green
'Aurora' is a vigorous deciduous tree to 15m tall, with broadly ovate leaves to 15cm long, heavily marbled and splashed with cream, white and pink, especially in spring and summer
P. nigra subsp. betulifolia is a bushy deciduous tree to 30m tall, with rough, dark grey bark, downy young shoots, triangular to ovate leaves 10cm long, and red male or green female catkins in early spring
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