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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.
C. brachytricha forms a clump of glossy green, linear leaves turning yellow in autumn, with narrow, fluffy, purple-tinged plume-like sprays of flower opening in late summer and early autumn and persisting into the winter
'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
C. fulvida is a species from wet habitats in New Zealand. It has large, gracefully curving silver-brown flower panicles, pink-tinged when young, above the arching foliage
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
T. orthopoda is a dwarf perennial bulb, up to10cm tall, with broad grey-green leaves. Flowers are white with a yellow blotch and pale purple-grey markings on the outside of petals and appear in late spring
'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
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