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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.
S. exigua is a suckering shrub forming a thicket of slender stems bearing narrowly lance-shaped to linear leaves to 10cm long, silvery when young, later grey-green
'Wehrhahnii' is a slow-growing, small, spreading deciduous shrub with erect, purple-brown shoots bearing silvery-white male catkins, later yellow, followed by bright green leaves later dark, glaucous beneath
S. nakamurana var. yezoalpina is a prostrate shrub, with long trailing arms, to 30cm high and up to 3m across. Rounded to ovate, net-veined leaves are held on long stalks and emerge covered with silky white hairs. Leaves mature to a glossy green before turning yellow in autumn. Silky, yellowish catkins are borne in spring
'Sekka' is a vigorous, spreading shrub ultimately forming a very large, dense thicket up to 5m high and 10m across. Many of the stems are curiously flattened and twisted, but still produce small, lance-shaped, bright green leaves and showy, silvery catkins with golden-yellow anthers in early spring
'Melanostachys' is a bushy shrub to 3m tall, with oval, glossy leaves that are grey-hairy when young; showy black catkins open in early spring and have orange-red anthers that turn yellow as they mature
'Tristis' is a fast-growing weeping willow with narrow leaves on slender yellow branches, and slim female catkins in early spring
S. purpurea is a spreading shrub or small tree to 5m, with arching purplish shoots bearing narrowly oblong, blue-green leaves and slender silvery catkins on bare shoots in early spring
'Crispa' is a medium-sized, deciduous tree of upright, open habit with narrow, spirally-curled, green leaves that are twisted around the straight stems. Small, yellowish catkins are borne in spring
S. repens var. argentea is a deciduous bushy shrub, to 1m tall and 2m wide, initially upright in habit then arching and spreading. Narrowly-oval, densely-hairy leaves are grey-green above and silvery beneath and appear after the silvery catkins that mature to yellow in spring
S. caprea is a rounded deciduous shrub or small tree with broadly elliptic leaves greyish beneath, and large grey catkins in spring
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