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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
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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.
'Arnhem' is a tall, herbaceous perennial that can reach 2m. The leaves have oval leaflets with jagged edges and the wiry, branched flower stalks carry deep rose pink, drumstick flowers in summer
'Amethyst Myst' forms a neat clump of wine-red leaves, suffused with silvery-grey between the veins, and deep red beneath, with sprays of small off-white flowers in early summer
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
'Gypsy Romance' is a vigorous, spreading plant with glaucous foliage to 65cm, erect, or lax at edge of clump. Standards are overlapping, purple with blue and violet tones, paling towards centre. Falls are drooping to incurved, velvety with crimped margins, deep purple violet approaching black. Beard fairly conspicuous, violet blue. Mid season
D. macropodum is a large, evergreen shrub to about 6m high and wide with dark green, glossy, rhododendron-like leaves that tend to droop in winter, revealing the bright red leaf stalks. Young spring foliage is pale green, often flushed pink. Red male and green female petal-less flowers are borne on separate plants in late spring. Pollinated female plants produce heavily-bloomed black berries in autumn
S. flava is a carnivorous perennial to 90cm, with slender yellow-green pitchers with erect lids, and nodding yellow flowers 10cm across
'Variegatum' is a semi-evergreen perennial forming a low clump to 10cm in height, with fleshy, bluntly toothed obovate leaves margined with creamy-white and tinged pink, and loose clusters of starry bright yellow flowers in late summer
'Hydon Dawn' is a compact medium-sized shrub of dense habit, with glossy, dark green foliage with cream felt beneath. Rounded trusses of frilled, pale pink flowers 5cm in width, which fade to near white
H. sieboldii is a small, compact, clump-forming perennial. Leaves are narrow, lanceolate, to 15cm in length with mid-green centres and narrowly-edged with white. Funnel-shaped, lavender-coloured flowers, on stems to 60cm, appear in mid to late summer
A. × grandiflora is a medium-sized semi-evergreen shrub to 3m, with arching branches, bearing small glossy oval leaves and clusters of pale pink, slightly fragrant flowers over a long period from mid-summer
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