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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
'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
N. mutabilis is an upright annual to 1.5m tall with a basal rosette of large, oval leaves. In summer, airy clouds of trumpet-shaped flowers are borne on branching stems changing colour as they age from white through shades of pink
'Rotschwanz' is a rounded deciduous shrub with glossy dark green leaves that colour wine-red in autumn. Flattened lacecap flowerheads with large deep red, cross-shaped sterile flowers and fertile flowers of pink and white are produced in mid and late 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
'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
M. carmenae is a clustering cactus with globose stems to 8cm in height, the areoles with about 100 cream radial spines; white or pink-tinged flowers 1cm in length are borne towards the apex of each stem in spring and summer
R. mulliganii is a vigorous large rambler to 6m, with glossy foliage, purplish when young. Large clusters of banana-scented white flowers 5cm in width, with prominent yellow stamens in summer. Small orange-red hips in autumn
'Gilt Edge' is an evergreen tree of dense, broadly columnar habit, with dark green, oblong leaves with a fine, pale yellow border, and saucer-shaped white flowers, 5cm across, in early to mid-summer
'Tremalzo' is a very slow-growing dwarf evergreen shrub to 10cm tall, with narrow, dark green leaves and pure white flowers with a tiny yellow eye, opening in late spring
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