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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.
Crown Princess Margareta has arching stems that can be left to produce a 1.5m high shrub, or trained as a 3.5m high climbing rose. The flowers, produced in summer and autumn, are fragrant, fully-petalled rosettes in apricot-orange
'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
'Gallery Pablo' is a compact plant to 50cm, with light coral-red flowerheads, the florets shading to apricot-yellow towards the base
A. thomsonii is a clump-forming perennial, to 1m tall, with oval, toothed leaves, up to 10cm long, on hairy stems. Flowerheads, up to 5cm across, comprising lavender-blue rays and a central yellow disk, are held on slender branches from late summer into autumn
'Gerda' is a deciduous shrub or small tree, with deep purple foliage from spring to autumn and flat heads of small, pinkish-purple flowers, followed by purple-black berries
'Alison Taylor' grows to 60cm in height, with up to 5 flowers per stem, the standards ochre yellow fading to cream in the centre, the falls bright lemon yellow edged with ochre yellow
'Maiden's Blush' is a trailing perennial with lance-shaped leaves that emerge pink, becoming green; small white flowers open sporadically through the year, but it is not free-flowering
'Firebird' is a clump-forming, evergreen perennial to 2m tall with upright or slightly drooping sword-like leaves rangeing in colour from bronze-green through purple-green to bronze-orange with bright red stripes and margins. In summer, erect stems bearing panicles of tubular red flowers may appear
'Ashby' is a bushy plant growing to 90cm tall and wide at maturity. The lobed, scented leaves are mid- to dark-green and flowers are a pink-purple colour with dark central markings on the upper petals
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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.