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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.
'Mariesii Grandiflora' is a small deciduous shrub with glossy ovate leaves and large, flattened Lace-cap flowerheads with blue or pink fertile florets surrounded by large, white sterile ones
'Fascination' is an upright perennial to 1.2m tall, with whorls of lance-shaped, toothed leaves and dense, slender, branched spikes of small light violet-blue flowers in summer and early autumn
S. nicolai is a massive, evergreen perennial, with oblong, grey-green leaf blades up to 1.5m long on 2m long leaf stalks. In spring it produces blue and white flowers, opening in succession, from blackish, beak-like spathes
'Titan's Glory' is an herbaceous perennial to 1m in height, with glaucous green foliage and large, fragrant, ruffled, deep indigo-blue flowers in early summer
'Helen' is a perennial forming a rosette of oblong, hairy leaves, with loose clusters of pale violet-blue flowers to 6cm across
'Sheila Ann Germaney' is a dwarf bulbous plant with pale blue flowers in late winter, the falls with a yellow midrib and darker grey-blue veining
'Pineapplette' has bright yellow-green leaves with prominent rounded teeth, freely speckled with deep crimson
Blue Bird Group are tall, upright perennials producing a mound of glossy, divided foliage and tall spires of single, mid-blue, white-eyed flowers in early to mid-summer
'Touch of Snow' is a deciduous, bulbous perennial, to 20cm in height, with green, strap-like leaves and dense flower spikes, mid-blue with white tips to the petal edges in spring. Flowers initially open from green buds and flower spike tips appear white before darkening to mid-blue
P. auriculata is an evergreen shrub to 4m or more (with support), with slender, scandent stems bearing light green, spoon-shaped leaves and terminal racemes of sky-blue, long-tubed flowers 15mm across
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