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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
'Squirrel' is a robust, compact, dwarf evergreen azalea with funnel-shaped, bright reddish-orange flowers in late spring
A. micranthum forms a large shrub or small tree with arching branches and reddish young shoots and greenish-white flowers. Toothed foliage turns orange, yellow and red in autumn
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
'Brookfield Delight' is a Lilliput dahlia growing to about 50cm, the single flowers having orange rays and a yellow disk
'Jury's Yellow' is a compact and erect evergreen shrub with medium-sized, anemone-form white flowers with conspicuous yellow petaloids in the centre
'Becky Towe' is an upright herbaceous perennial with bright pink, mauve-eyed flowers set against green and cream variegated foliage
'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
'Emerald Feathers' is a vigorous, deciduous conifer making a large, well-shaped conical tree to 25m, with flat sprays of soft, light green, yew-like leaves that turn brownish-pink and yellow in autumn. The bark is shaggy and red-brown; flowers and cones insignificant
A. × prunifolia, the purple chokeberry, is probably a natural hybrid between A. arbutifolia and A. melanocarpa. It has a multi-stemmed habit, white flowers in late spring followed by purple-black berries and matt, dark green leaves with brilliant autumn colour
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