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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.
'Night Star' is a compact plant to 30cm tall, with grey foliage and single flowers 3cm across. Petals broad, with toothed edges, deep red-purple with rich pink margin and blotches
'Master Michael' is a rounded, evergreen shrub with wavy-edged leaves that are grey-green above and felted, pale green below. The daisy-like flowers are purple with yellow centres and appear in profuse clusters in late spring
'Eileen Postle' is a compact plant to 30cm in height, with cerise flowers 6cm across, the upper petals dark-veined
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
S. verna is a dwarf bulbous perennial to 20cm, with linear leaves and small, starry violet-blue flowers in a dense raceme or corymb in early spring
'Eileen Neal' is a vigorous perennial with strongly clove-scented double flowers to 6cm across, the slightly fringed petals salmon-red with purple flecks
'Dartmoor' is a large, vigorous, deciduous shrub with arching branches bearing lance-shaped leaves, white beneath. Flowers scented, light purple, in broad, branching panicles at ends of current year's shoots
Midnight Reiter strain is a herbaceous perennial with finely-divided, deep purple leaves and purple-blue flowers 2cm across
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
'Halios Bright Fuchsia' is a tuberous perennial to 30cm, with silvery-marbled leaves and vivid purplish-red flowers with deep purple mouth, borne in autumn and early winter
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