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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.
'Cabaret' is a tall, clump-forming grass up to nearly 2.5m high. The dark green leaves, up to around 32mm wide, have a broad central white stripe and are topped in the autumn by coppery-pink flowerheads that turn a silver colour as they mature
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
S. lanata is a bushy, slow-growing small deciduous shrub with rounded, silvery-woolly leaves to 6cm in length. Male catkins erect, to 5cm, silvery becoming yellow; female catkins longer, greenish
'Rubra' is a deciduous grass forming a loose clump of erect, linear green leaves strongly suffused with deep red, and narrow silvery flower panicles in late summer
L. vanzyliae is a bulbous perennial up to 25cm high, growing from autumn to spring, with long fleshy green leaves that are heavily-spotted above with maroon-brown. From late winter to early spring spikes of hanging tubular flowers, about 3cm long, appear. Flowers are pale grey-green-blue at the base and yellowish grey-green at the apex, and tipped and edged in grey
'Undine' is an elegant clump-forming deciduous grass to 2m tall, with long, narrow, arching leaves that turn orange and yellow in autumn, and reddish flower heads ageing to pale silvery-brown in late summer
'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
'Burghaltii' is a clump-forming perennial with ovate leaves and erect stems to 60cm in height, bearing nodding, narrowly bell-shaped, pale grey-mauve flowers up to 10cm in length
'Tristis' is a fast-growing weeping willow with narrow leaves on slender yellow branches, and slim female catkins in early spring
'Goring Silver' is a trailing perennial grown as an annual, with rounded, grey-white leaves; insignificant flowers in summer are best removed as they appear
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