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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.
A. pontica is a vigorous herbaceous perennial making a spreading clump of upright stems to 75cm, clad in dissected, grey-green, highly aromatic leaves, with small greyish-yellow flowerheads in panicles at the tips of the stems
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
C. coggygria is a large, bushy, deciduous shrub to 5m, with rounded leaves turning yellow, orange and red in autumn. Large feathery inflorescences are buff at first, later greyish
D. cespitosa is an evergreen grass forming a neat tussock of narrow, leathery, dark green leaves to 60cm long, with feathery panicles of silvery-purple flowers on arching stems in summer
E. giganteum is a robust biennial or short-lived perennial forming a rosette of heart-shaped basal leaves, and spiny stem leaves, with cone-like umbels of tiny blue flowers sitting within a rosette of spiny silvery-grey bracts
E. variifolium is an evergreen perennial to 40cm tall, forming a clump of rounded basal leaves with white veins, with branched, leafy stems bearing silvery-blue flower-heads with narrow, spiny silver bracts
G. elliptica is a shrub or small tree of rapid growth and bushy habit, to 3.5m or even to 4.5m in mild areas. Leaves oval to roundish, dark shining green above, felted grey beneath. The long, grey-green male catkins flower in January and February. The female plant is less commonly seen, but produces long clusters of purple-brown fruits in summer
K. daigremontiana is an upright succulent perennial with trinagular-lance-shaped, grey-green leaves, often spotted with brown, and with a row of plantlets on each edge; pendent, tubular greyish pink flowers 2cm long open in winter
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
M. sacchariflorus is a vigorous, upright deciduous grass to 2.5m or more in height, the long arching leaves 3cm wide, with a prominent white midrib; in autumn, fan-shaped silky flowering panicles appear, lasting into winter
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