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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 Horizon' is a cultivar with a good tight growth habit. Flowers are violet-blue with a small orange eye
'Harlequin' is a variegated deciduous shrub to 3m, with lance-shaped leaves margined with creamy-white, and dense cylindrical sprays of small, fragrant reddish-purple flowers in summer and autumn
'Île de France' is a deciduous, bushy shrub, to 3.5m tall and wide, with arching branches and lance-shaped leaves. Long racemes of deep violet-purple flowers with yellow-orange throats are borne from summer into autumn
'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
'Border Beauty' is a compact, deciduous shrub to 2m tall and wide with lance-shaped leaves and from summer into autumn, deep crimson-purple, fragrant flowers in panicles to 20cm long on dark stems
'Nanho Blue' is a deciduous shrub with neat, narrowly lance-shaped leaves and slender cylindrical panicles of light blue flowers in summer and autumn
'Pixie Blue' is a medium-sized, deciduous shrub, to around 2m tall and wide, with arching branches and lance-shaped leaves. Compact panicles of fragrant, pale mauve-blue flowers are borne in summer and autumn
'Panache' is a deciduous, bushy shrub, to around 2.5m tall, with arching branches and grey-green, lance-shaped leaves. Its deep purple-blue flowers are held in broad, branched panicles that often droop to the ground owing to their weight
Camberwell Beauty is a compact and free-flowering shrub with abundant, fragrant purple flowers through the summer
'White Profusion' is a vigorous large deciduous shrub with arching branches and narrow leaves, whitish beneath. Flowers scented, white with yellow eye, in long panicles
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