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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
B. madagascariensis is a strong-growing, lax evergreen shrub with white-hairy shoots, narrow dark green leaves white-felted beneath, and long slender panicles of fragrant orange-yellow flowers from autumn to spring
'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
B. fallowiana var. alba is a large deciduous shrub, branches arching and, like the lance-shaped leaves, covered with woolly white hairs. Flowers cream with an orange eye, sweetly scented
B. globosa is a large semi-evergreen or deciduous shrub to 5m, with dark green leaves and dense globose heads 2cm across of sweet-scented bright orange-yellow flowers in loose clusters at branch tips in early summer
'Morning Mist' is a semi-evergreen shrub and more compact than many other cultivars reaching a maximum height and spread of 2m. Its lance-shaped leaves are silver-grey and woolly. Short, dense panicles of white flowers with mustard-coloured centres are borne on arching branches in late summer
'Lochinch' is a large but compact deciduous shrub with arching branches, grey-green leaves and long slender panicles of light violet-blue, orange-eyed, sweetly-scented flowers
'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
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