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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.
'Rubin' is a clump-forming perennial with narrowly ovate leaves and erect stems bearing slender racemes of small pale pink flowers with purplish lower lips, in summer and early autumn
'Lubecca' is a bushy, erect perennial with greyish-green, ovate leaves and dense racemes of small deep violet flowers, with persistent maroon bracts, in summer and autumn
'Ostfriesland' is a compact, bushy perennial with narrowly ovate leaves and dense erect racemes of deep violet-blue flowers with pink bracts, in summer and autumn
'Rügen' is a herbaceous perennial forming a clump of mid-green, aromatic foliage, with erect dark stems bearing dense, terminal spikes of small, hooded, purple-blue flowers all summer
'Amethyst' is a bushy upright aromatic perennial with ovate leaves to 10cm in length and, in summer and autumn, erect stems bearing dense racemes of small, reddish-violet flowers with maroon calyces and bracts
'Caradonna' is a perennial cultivar with upright racemes of violet- purple flowers through the summer above narrow, rough, grey-green leaves
'Porzellan' is a bushy, erect perennial with narrowly ovate leaves and dense racemes of small, pale bluish-white flowers
'Blauhügel' is an herbaceous perennial forming a clump of mid-green foliage, with erect stems bearing dense terminal spike-like racemes of small, deep violet-blue flowers in early summer
Sensation Rose is a bushy, upright perennial with grey-green leaves and, in summer and autumn, erect stems bearing dense spikes of hooded, pink flowers with purple calyces and bracts
Sensation Deep Blue is a compact, clump-forming perennial, to 30cm tall, with aromatic, grey-green leaves and dense, erect spikes of purple-blue flowers in summer
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