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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.
'Silver Sparkler' is a spreading evergreen sub-shrub to 25cm tall, with narrowly oblanceolate leaves margined with creamy-white; white flowers 6cm across, violet at base, with a blue disk, open from late spring to autumn
'Blackthorn Seedling' is a bushy perennial with narrow foliage and, from late spring to autumn, daisy-like flower-heads to 6cm across, with deep pink rays surrounding a yellow disk
'T.E. Killin' is a vigorous herbaceous perennial to 90cm tall, with narrow dark green leaves and double white flowers 10cm wide, the centres with short white florets
'Stardust' is an evergreen perennial with striking flowers with purplish-red ray florets, which are mauve on the underside, for a long period over the summer
'Hopleys' is a spreading perennial with olive-green, spoon-shaped leaves and flowerheads to 6cm across, the rays purplish-pink with a white base, the disk dark, becoming yellow
'Lady Leitrim' is a spreading perennial with narrow, dull grey-green leaves and flower-heads 6.5cm across, the rays white, with age becoming tinged with purplish-pink at base and tip, surrounding a yellow disk
'Beauté Nivelloise' is a clump-forming deciduous perennial to 1m in height, with narrow, dark green, glossy leaves and white flowers with spidery, slightly twisted petals 10-12cm in width, yellow in the centre
R. acris is an upright perennial with long-stalked, palmately divided leaves and open panicles of bright glossy yellow, bowl-shaped flowers 2.5cm across
'Master Michael' is a rounded, evergreen shrub with wavy-edged leaves that are grey-green above and felted, pale green below. The daisy-like flowers are purple with yellow centres and appear in profuse clusters in late spring
R. hosmariense is a woody-based spreading perennial to 30cm in height, with silvery leaves divided into narrow segments, and solitary yellow-centred white daisies held just above the foliage
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