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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
'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
O. jucundum is a rhizomatous perennial to 45cm in height, with narrow, aromatic grey-green leaves and solitary daisy-like, light pinkish-purple, dark-eyed flowers 5-6cm in width
'Buttermilk' is an evergreen subshrub to 45cm in height, with oblanceolate leaves and daisy-like flowerheads to 7cm across, ray florets light yellow fading to white at base, disk florets bluish-purple
'Sunny Fiona' is a mound-forming, evergreen, frost-tender perennial growing to 35cm tall with toothed, obovate leaves. Daisy-like flower heads are freely produced on branching stems from spring to late summer and comprise light pink ray florets which darken with age surrounding a dark brown centre
'Pink Whirls' is an evergreen subshrub to 40cm in height, with lance-shaped, coarsely toothed leaves and purplish-pink, daisylike flowerheads 5cm across with ray florets pinched at the middle, spoon-shaped at tip; disk blue
'Merriments Joy' is a robust perennial with light green, narrow leaves and 6cm in width pinkish-purple flowerheads with yellow centres
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We're a UK charity established to share the best in gardening. We want to enrich everyone's life through plants, and make the UK a greener and more beautiful place.