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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.
'Lady Gilmour' is a tall perennial with leaves of three leaflets that have crisped margins when young; bowl-shaped pink flowers 6cm across have about 12 narrow, somewhat twisted petals
'Pretty Lady Diana' is a compact cultivar reaching 60cm in height. Single flowers of mixed pinks, with a central boss of yellow stamens, bloom through summer and early autumn
'Whirlwind' is a tall suckering perennial with large leaves of three leaflets, and semi-double white flowers 6cm wide, with narrow, slightly rolled petals
'September Charm' is an herbaceous perennial to 75cm, with leaves composed of three oval leaflets, and slightly cupped flowers 6-8cm wide, with 6-9 light rose-pink petals, deeper pink beneath, opening in late summer and autumn
'Andrea Atkinson' is an herbaceous perennial to 1m tall, with lobed basal leaves and white flowers 6cm wide, tinged with pink and green on the outside, and opening in late summer and autumn
'Pretty Lady Susan' is an herbaceous perennial with dark, divided leaves and vivid pink semi-double flowers and contrasting yellow stamens
'Elegans' is a tall, erect perennial with ternate foliage and, from late summer to autumn, bowl-shaped, light pink flowers to 7cm across, with broad outer petals, and narrow inner ones
'Robustissima' is a tall plant with divided leaves and 5-petalled pink flowers 5cm wide, borne on reddish stems from late summer to autumn
'Königin Charlotte' is a perennial with attractive, divided leaves and large rich rose-pink, semi-double flowers with 10-15 overlapping petals
'Honorine Jobert' is an herbaceous perennial with dark, divided leaves and pure white flowers with 6-9 tepals and contrasting yellow stamens
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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.