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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.
'Purple Kiss' is a compact, clump-forming perennial to 60cm high with dark green, lance-shaped leaves and large clusters of fragrant flowers with deep purple, overlapping petals surrounding a white eye
'Danielle' is a herbaceous perennial, up to 70cm high, with dark green lance-shaped leaves and beautifully-scented weather-resistant pure white flowers over a long period in midsummer
'Othello' is a herbaceous perennial about 1m high with lance-shaped leaves which open dark green, flushed with purple which fades with age, and many clusters of fragrant, claret-red-pink flowers from summer to autumn
'Prince of Orange' is an erect herbaceous perennial to 80cm tall, with lance-shaped leaves and fragrant, orange-red flowers in large terminal panicles in mid summer
'White Admiral' is an herbaceous perennial of upright habit, to 90cm tall, with lance-shaped leaves and panicles of fragrant, pure white flowers in mid and late summer
'Rosa Pastell' is a herbaceous perennial, up to 70cm high, with dark stems, green lance-shaped leaves and highly-scented, pale pink flowers with a darker eye, from dark buds, in mid and late summer
'Prospero' is an herbaceous perennial to 90cm tall, with dark green lance-shaped leaves and terminal panicles of fragrant, white-eyed, light lilac-purple flowers with pale-edged petals, in early summer
'Blue Paradise' is an upright perennial to 1.2m tall, with lance-shaped leaves and rounded heads of fragrant, dark-eyed violet-blue flowers in early summer
'Otley Choice' is a clump-forming perennial to 80cm tall with lance-shaped, green leaves, and from summer to early autumn, upright panicles of scented, saucer-shaped, rose-pink flowers
'Grey Lady' is a bushy, upright herbaceous perennial, growing to a height of 1m, with narrow, green leaves and pale lavender-grey clusters of fragrant flowers from midsummer; flowering earlier than many other cultivars
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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.