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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.
C. indivisa is a slow-growing, evergreen erect tree reaching heights of 3m or more. The lance-shaped, blue-green leaves are relatively broad at 10-30cm wide and from 0.6-2m long with an orange-brown midrib. Small, white, star-shaped flowers borne in dense clusters in summer are followed by tiny purple-blue fruits
N. obvallaris is a bulbous perennial to 30cm tall, with glaucous, strap-shaped leaves and solitary bright yellow flowers with flared trumpets and slightly paler perianth segments, opening in early spring
'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
'Crimson King' is a vigorous medium-sized deciduous tree. Leaves large, 5-lobed, deep purplish-crimson all summer. Flowers reddish-orange, in clusters on leafless branches
'Kestrel' is a strong-growing upright perennial to 2m tall, with large, dark green leaves and semi-double, rich blue flowers to 6.5cm across, in spikes to 90cm long, with many side branches, flowering in early summer
'Daydawn' is a spreading, bushy deciduous shrub to 80cm tall, with small, pinnate leaves and saucer-shaped pale yellow flowers tinged yellow and pink, from early summer to early autumn
'Whirling Butterflies' is an upright herbaceous perennial to about 80cm, producing airy spires of delicate white flowers with long white stamens, opening from pink buds over a long period from late spring to early autumn
'Devon Maid' is a bushy evergreen perennial with grey foliage and stems to 35cm, bearing clove-scented, semi-double white flowers 5cm in width, with fringed petals and a deep crimson eye
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
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