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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.
'Remembrance' is a large-flowered cultivar. It flowers in spring and has shiny violet flowers with prominent orange stamens
'Fairy Tails' is a deciduous, perennial grass to 1.2m tall, producing a relatively upright clump of greyish-green leaves, topped with arching, silvery-pink flowers that fade to buff, from mid-summer to the first frosts
C. fulvida is a species from wet habitats in New Zealand. It has large, gracefully curving silver-brown flower panicles, pink-tinged when young, above the arching foliage
I. cernua is an evergreen herbaceous annual or perennial, 15-30cm high, with very narrow, thread-like leaves, topped from mid to late summer by small silvery-white petal-less flowerheads which are followed by small brown-red seedheads
'Malepartus' is a vigorous, free-flowering deciduous grass to 2m tall, with arching leaves with white midribs, and proific, pink-tinged flower heads soon ageing to silver, opening in late summer
'Smokey Blue' is a clump-forming, semi-evergreen herbaceous perennial, up to 45cm high, with deep green leaves and dark slate-purple flowers, from late winter to spring
C. brachytricha forms a clump of glossy green, linear leaves turning yellow in autumn, with narrow, fluffy, purple-tinged plume-like sprays of flower opening in late summer and early autumn and persisting into the winter
'Rubra' is a deciduous grass forming a loose clump of erect, linear green leaves strongly suffused with deep red, and narrow silvery flower panicles in late summer
'Gillian Dallas' is a perennial to 1.5m in height, with divided foliage and racemes 75cm in length of white-eyed, pale slate-mauve flowers
Blue Tit Group is a dwarf, compact evergreen shrub, to around 1m tall, with small leaves that are yellowish-green when young, turning mid-green when mature. Trusses of funnel-shaped grey-blue flowers are borne in spring
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