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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.
'Ushguli Grijs' is a herbaceous perennial, up to 30cm high, forming dense clumps with lobed green leaves, tinted red in autumn, and grey-blue flowers, with purple veins, in early summer
'Tirra Lirra' is a vigorous but compact herbaceous perennial to 30cm in height, with glaucous green foliage and soft greyish blue flowers, the falls greyer, with white beards tipped with orange
'James Roof' is a large vigorous bushy evergreen shrub with leathery dark green leaves. Flowers male, in drooping grey-green catkins to 20cm in length
'Bromyard' is a rhizomatous perennial to 28cm, with short, broadly sword-shaped leaves. Flowers blue-grey, the falls with a large ochre-yellow patch and yellowish beard
K. glauca is a semi-evergreen perennial grass forming a compact tuft of narrow grey-green leaves and, in summer, silvery-green, cylindrical flowering panicles
E. macrophylla is a vigorous, wide-spreading evergreen shrub, to 3m high and 5m wide, with spineless branches which are covered in silvery scales when young. Broad, rounded leaves, 5-12cm long, are intensely silvery when young because of the silvery scales on both sides which gradually wear off the upper surfaces so that they become glossy dark green. Clusters of small but extremely-fragrant, silvery-cream flowers in autumn are followed by edible, oval, red fruit in late spring or early summer
'Ferner Osten' is a clump-forming deciduous grass to 1.5m tall, with narrow, arching leaves which turn dull orange in autumn and early winter, and feathery flower panicles which open deep red, ageing to pink and silver
'Pickwick' has large purple-striped flowers on a greyish-white background with orange stamens and stigma in spring
S. aegyptiaca is a bushy shrub or small tree with red-purple shoots and oblong, dark green leaves up to 15cm long. Fragrant, silvery, male and female catkins are borne on separate trees in late winter or early spring, before the leaves open. Male catkins are up to 4cm long with bright yellow anthers; female catkins up to 8cm long
'Morning Light' is a compact deciduous perennial with narrow leaves finely edged with white, and pink-tinged panicles of flowers in autumn
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