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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.
'Arthur Simmonds' is a deciduous shrub of low, arching habit, with dark green leaves, greyish beneath, and clusters of bright violet-blue flowers in late summer
Sterling Silver is a compact, bushy shrub to 1m tall with silvery-green aromatic foliage and deep violet-blue flowers in late summer
Hint of Gold is a bushy, deciduous shrub to 1m tall with toothed, bright golden-yellow leaves with a green margin. Rich blue flowers are borne from late summer into early autumn
'First Choice' is a compact deciduous shrub with bluntly toothed, grey-green leaves paler beneath, and clusters of vivid blue flowers opening from deep indigo-blue buds in late summer.
'Heavenly Blue' is a compact, upright shrub to 1m tall, with arching branches bearing toothed, grey-green leaves and clusters of small dark blue flowers in the leaf axils in late summer and early autumn
'Summer Sorbet' is a bushy cultivar with variegated leaves, green with a gold edge, and pale blue flowers in late summer and autumn
Pink Perfection is a clump-forming, upright shrub to about 90cm with pale, greyish-green leaves and whorls of pale pink, fluffy flowers in late summer to early autumn
'Worcester Gold' is a rounded deciduous shrub with deep yellow foliage and clusters of small violet-blue flowers from late summer
'Kew Blue' is a compact shrub of rounded habit, with toothed grey-green leaves and axillary clusters of small dark blue flowers in late summer and early autumn
'Dark Knight' is a rounded, deciduous shrub to 1.2m tall with ovate to lance-shaped aromatic leaves which are silvery below. In late summer and early autumn, a profusion of deep blue-purple flowers are borne
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We're a UK charity established to share the best in gardening. We want to enrich everyone's life through plants, and make the UK a greener and more beautiful place.