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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.
V. agnus-castus f. latifolia is a large, spreading, deciduous shrub with dark green, palmate leaves comprised of five or seven oval, pointed, aromatic leaflets. Branched sprays of small, purple (occasionally white or dark blue), fragrant flowers appear on the ends of the branches in early to mid-autumn
'Wellsiana' is a compact semi-evergreen perennial forming a spreading clump to 10cm in height, with dark green leaves and large, long-stemmed, very fragrant, deep purple flowers
A. hupehenis is a clump-forming perennial, to 1m tall, with toothed leaves divided into three lobes. Five-petalled flowers, 5-6cm in diameter, are borne from summer into autumn on upright stems in varying shades of pink, purple or white
'Regency Belle' is an herbaceous perennial to 90cm in height, with narrow yellowish-green foliage and violet flowers with darker, spreading falls, marked with white at the base
Garden Beauty Purple is a compact evergreen shrub with small, rounded, deep green leaves, margined red, with short internodes and pale brown stems. In early summer, terminal racemes of clear purple flowers are carried in profusion, eventually fading to a paler shade
Wild Rover is a floribunda rose that may be grown as a shrub, reaching about 1.2m in height, or as a small climber reaching 1.8m. It has an upright, bushy habit and bears clusters of semi-double, scented flowers in a reddish-purple, with a central golden boss, through the summer until autumn
'Purple Delight' is an evergreen perennial to about 90cm, producing a clump of narrow, glossy, strap-shaped leaves. Rounded umbels of purple, narrow funnel-shaped flowers appear from mid-summer to early autumn
'Blue Boa' is a herbaceous perennial with bright green, aniseed-scented leaves. Spikes of purple flowers are produced from mid-summer to mid- autumn
'Art' is a curious ornamental cultivar that bears umbels that open in early summer. Each purple flower is held on a long wiry stem. These umbels develop bulbils at their base. Height to around 50cm
L. purpurea is a vigorous perennial with erect stems clad in narrow, grey-green leaves, with purple flowers 1.5cm long in slender terminal racemes in summer and early autumn; often seeds freely
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