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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.
'Heavy Metal' is a rhizomatous perennial grass forming clumps of upright metallic blue-grey leaves, turning yellow in autumn. Broad, diffuse, weeping panicles to 50cm long of tiny purple-green spikelets in early autumn
'Warrior' is a deciduous perennial grass forming a clump of flat, linear leaves turning yellow in autumn, and large purple flowering panicles
'Rotstrahlbusch' is an upright, clump-forming perennial growing to 140cm tall. The green leaves, to 10mm wide, begin acquiring reddish tones in mid-summer before turning a deep burgundy red in autumn and fading to a tan colour in winter. The leaves are topped with airy clouds of pink-tinged flower panicles in mid-summer
'Northwind' is a deciduous, perennial grass, to 1.5m tall, forming an upright clump of flat, linear, blue-green leaves turning yellow and orange in autumn. Large, airy sprays of tiny pink and green flowers are produced in late summer and persist into mid-autumn
'Dallas Blues' is a deciduous perennial grass, 1.5 - 1.8m in height with flat, narrow, lance-shaped, blue-green leaves in spring and summer turning yellow-brown in autumn. Diffuse panicles of small purple-pink spikelets are borne in late summer
'Prairie Sky' is a deciduous perennial grass to 1.5m in height with flat, narrow lance-shaped, blue-green leaves from spring to summer, turning orange-yellow in autumn. Drooping branched panicles of small blue-green spikelets are borne in early autumn
'Heiliger Hain' is a clump-forming, upright, perennial grass to 1m tall with blue-green leaves that turn a deep red-purple colour in autumn. Erect stems bear airy heads of tiny purple flowers from late summer into autumn
'Shenandoah' is a deciduous, clump-forming perennial grass, to 90cm in height, distinguished by its steely blue-green leaf colour, which takes on tones of violet, purple, burgundy and wine red in late summer. Forms stiff, dense clumps which persist through winter. Flower spikelets tiny, purplish, held in large open panicles, to 105cm
'Hänse Herms' is a clump-forming, upright, perennial grass to 1.2m tall. Dense, green leaves turn a deep burgundy-red in the autumn and airy heads of tiny purple flowers are held above the foliage from summer into autumn
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We're a UK charity established to share the best in gardening. We want to enrich everyone's life through plants, and make the UK a greener and more beautiful place.