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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.
'Red King' is a clump-forming perennial, to 70cm in height, with narrow, strap-like leaves and racemes of bright red, funnel shaped flowers with hints of yellow, to 10cm across, in late summer. Anthers are golden yellow as are the flower throats
'Limpopo' is a cormous perennial, up to 75cm high, with grass-like green leaves. Arching sprays of large flowers, up to 6cm across, of orange and salmon-pink with apricot-coloured throats, appear over a long period in late summer
T. disticha subsp. rubrolucens has upright, sword-shaped leaves up to 70cm long. In mid- to late summer it bears a succession of pink, open funnel-shaped flowers about 2cm across in one-sided spikes on wiry stems
Corms produce blade-shaped leaves and flower spikes in the later part of summer. Along these are elegantly spaced, flared flowers with alternating pale and dark orange petals that are red orange in bud
'Emily McKenzie' is a compact, upright perennial growing to 60cm with erect, narrow leaves. Dense, arching spikes of deep-orange flowers with reddish-purple throats emerge from purple buds in late summer
C. masoniorum is a corm forming clumps of narrow leaves and branched sprays of upward-facing, brilliant orange-red flowers 5cm in length, on stems to 1.2m in height, from midsummer
'George Davison' is a tall clump-forming perennial with erect, sword-shaped leaves and branched stems carrying several light orange-yellow flowers opening from orange buds
'Sulphurea' is a cormous perennial with narrow mid-green leaves and large sprays of tubular dark chrome-yellow flowers, with creamy-yellow throats, from summer to autumn
'Sunglow' is a cormous herbaceous perennial, up to 60cm high, with narrow mid-green leaves, and tubular golden yellow-orange flowers, 2.5cm across, arranged in two rows and facing sideways, from mid to late summer
'Mistral' is a clump-forming perennial with narrow, erect, mid-green, pleated leaves and sprays of bright-red flowers, tinged with fiery orange, on stems to 1m in height in summer
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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.