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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. micranthum forms a large shrub or small tree with arching branches and reddish young shoots and greenish-white flowers. Toothed foliage turns orange, yellow and red in autumn
L. nepalense is a stem-rooting lily with rhizomatous bulbs, upright or arching stems, and scattered deep green leaves. The unscented or unpleasantly scented, funnel-shaped flowers, produced in early to mid-summer, are white, greenish or yellow in bud, opening to reveal a maroon centre
F. viridescens is a cactus with bright green, usually solitary, globose or cylindric, shallowly ribbed stems to 30cm in height; central spines yellow, curved, to 5cm in length. Flowers 5cm, green or tinged with red
P. alopecuroides is grass forming a dense clump of narrow leaves to 60cm long, turning pale brown in winter, with tall stems bearing softly hairy, oblong, green to purple inflorescences in late summer and early autumn
'Lemperg' is a clump-forming, deciduous, perennial grass, slightly more compact than the species, with narrow arching leaves and pale, silvery-green flower panicles in summer. When the flowers and leaves die they turn buff-coloured and remain on the plant all winter
Wester Flisk Group are evergreen perennials to 80cm with erect stems and palmately-divided leaves with narrow, dark green leaflets. All stems are flushed with dark red, which suffuses into the leaf bases. Nodding, usually purple-edged, pale green flowers, to 2cm in width, are borne in large open clusters from midwinter to mid-spring
'Diligence' is a compact perennial to 40cm, with glaucous green leaves and up to 3 flowers, the standards pale lemon yellow tinged green, the falls greenish-yellow
'Roundway Titan' is an erect, robust, evergreen shrub to 1m tall and 1.65m across. The foliage is yellow-green with a pale midrib, and often produces vivid red tones in autumn and winter. Honey-scented, yellow-green flowers are produced from late spring to late summer, turning pale brown as they age, followed by yellow-green, berry-like fruit
Ashwood Garden hybrids are a seed-raised group of semi-evergreen herbaceous perennials, up to 30cm high, with dark green leaves, and flowers from late winter to spring in a wide range of forms, including single and double, plain, spotted, blotched and flushed forms, and in a wide range of colours, including white, green, yellow, peach, pink, purple, slate-grey, and black
A. macroacantha is a clump-forming, evergreen succulent, to 60cm tall and wide, comprising rosettes of narrow, pale blue-green leaves, up to 25cm long, with small brown teeth and a terminal black spine. After at least 15 years, purple-tinged green flowers may be borne on a branched stem up to 2m tall
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