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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.
'Orangeade' is a cormous perennial with narrow, pleated mid-green leaves and sideways-facing, glistening, vibrant deep tangerine-orange flowers, with projecting stamens, in summer
'Star of the East' is a perennial with narrow leaves and racemes of horizontal, light orange, pale-centred flowers to 10cm across, in late summer
'Norwich Canary' is a perennial to 60cm tall, with narrow leaves and branched spikes of funnel-shaped yellow flowers 2.5cm wide in summer
'Zambesi' is a vigorous, clump-forming perennial, to 1m tall, with upright, narrow leaves and arching flower stems. The upward-facing orange flowers, with darker orange centres, are borne from late summer into autumn
'Golden Ballerina' is a cormous herbaceous perennial, up to 90cm high, with long, ribbed, pale green leaves and strong, arching stems with bright orange buds which open to very large, rich golden yellow-orange flowers with swept-back tepals and projecting stamens, from late summer to early autumn
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
'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
'Hellfire' is a large-flowered cultivar bearing rich red flowers in summer. These outward-facing flowers are borne on arching stems of approximately 1m in height
'Honey Angels' grows to 75cm and has narrow, sword-shaped leaves and branched stems carrying several small, trumpet-shaped yellow flowers in late summer
'Paul's Best Yellow' is a cultivar whose arching stems bear large, pure mid-gold flowers in late summer and early autumn. These appear almost freesia-like and are outward-facing. Stems reach around 1m in height
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