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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.
'Gloire de Versailles' is a vigorous medium-sized deciduous shrub of rounded habit, with broadly oval, light green leaves to 8cm in length, and large panicles of scented powder-blue flowers
'Blue Sapphire' is an arching, evergreen shrub with glossy, very dark green foliage with bronze tints.Tight clusters of small, rich blue flowers are produced in mid- to late spring
'Puget Blue' is a medium-sized evergreen shrub of upright habit, with small, dark green, narrow leaves. Flowers deep rich blue in conical or oblong panicles, in late spring and early summer
'Blue Mound' is a bushy medium-sized evergreen shrub of broad, dense habit, with glossy oblong-ovate leaves and compact heads of small bright blue flowers in late spring
'Italian Skies' is a spreading medium-sized evergreen shrub with small, glossy dark green leaves and small bright blue flowers in compact conical clusters in late spring
'Skylark' is a compact evergreen shrub with finely toothed, glossy dark green leaves and clusters of deep blue flowers in early summer
'Pershore Zanzibar' is an evergreen shrub with light greenish-yellow leaves blotched with dark green in the centre; light blue flowers open in late spring and early summer, but not free-flowering
C. griseus is a medium-sized shrub, to 3m, with dark green leaves, grey-silky on reverse, and pale lilac-blue flowers in dense clusters (occasionally violet-blue)
'Trewithen Blue' is a large vigorous evergreen spreading shrub to 6m in height, with broadly oval or rounded leaves to 8cm in length, and slightly fragrant deep blue flowers in panicles to 12cm in length
'Concha' is an evergreen shrub of dense habit, to 3m in height and width, with arching branches bearing narrow, dark green leaves and profuse clusters of deep blue flowers in late spring
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