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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.
'Blue Eclipse' is a medium-sized deciduous climber, up to 3 metres high, with divided green leaves and large bell-like flowers of deep blue with a white edge on the outside and white inside, followed by fluffy seedheads
'Subpumilum' is a compact deciduous fern to 10cm tall, with glossy black stalks bearing pedately divided fronds composed of fresh green, close-packed oblong segments
'Diana Clare' is a vigorous semi-evergreen perennial with narrow silvery-green leaves, lightly speckled with dark green near the margins, and violet-blue flowers from late winter to late spring
Opal is a semi-evergreen perennial with ovate leaves heavily blotched and speckled with silver; clear pale blue flowers open from pale pink buds in spring on stems to 35cm tall
D. oleoides is a dwarf evergreen shrub of variable habit, usually under 60cm tall, forming low hummocks. Leaves are almost stalkless, squareish and bristle-tipped, glossy above and downy below when young. Flowers are white, cream or yellowish, sometimes pink tipped, borne in terminal clusters in late spring and early summer, scented. Fruits are orange-red
'Sweet Heidy' is a spreading perennial, to 60cm tall, with neat, dense, lobed foliage and bowl-shaped flowers from early summer to early autumn. Flowers are pink, shading to purple with dark veining and a white centre
'Grand Prix' is a vigorous upright medium-sized shrub with bright red, semi-double flowers to 13cm across
M. racemosum is an herbaceous perennial to 75cm, the arching stems with broad-elliptic leaves and fluffy terminal panicles of fragrant creamy-white flowers, sometimes followed by reddish berries. Yellow autumn colour
'Gertrude Jekyll' is an evergreen perennial to 10cm in height, forming a compact mat of small, dark green ovate leaves, with abundant, pure white flowers 2-2.5cm in width
Argentea Group are herbaceous perennials to 30cm, forming a clump of ovate, green-edged, silvery leaves, with leafy stems bearing deep violet-purple flowers opening from dull red buds
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