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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.
'Arthur Bell' is a small shrub of upright, bushy growth, with glossy bright green foliage and clusters of fragrant, cupped, double flowers 8cm in width, opening bright yellow, ageing to creamy-yellow
Amber is a moderately-vigorous climber with double, nodding flowers composed of ribbed tepals, varying from amber to creamy-yellow, and tinged pink on the back of the petals. Flowering in late spring and early summer then again in early autumn; profuse seedheads follow
'Variegata' is a medium-sized single-stemmed evergreen shrub with stiff, spine-tipped leaves striped and edged creamy-yellow. Bell-shaped cream flowers in broad panicles to 2m in height appear in late summer and autumn
'Do Tell' is a clump-forming perennial to 90cm tall, with mid-green, divided foliage. The single flowers, produced in early summer, are pale pink with a large, central cluster of cream and dark pink staminodes
'Gay Kybo' is a bulbous perennial to 45cm in height, with strap-shaped leaves and neat, double, creamy-white flowers 10cm in width, the inner segments shorter, deep orange
Lady Series are semi-evergreen, herbaceous perennials with leathery, five-fingered leaves and outward-facing, cup-shaped, single flowers produced from late winter to mid-spring. Colours include white, yellow-cream, dark red, purple-black and metallic blue-black, also paler shades spotted with dark red or purple
'Sparkling Burgundy' is a bulbous perennial forming a rosette of upright, strap-shaped, reddish-purple leaves to 60cm long, with starry purple-tinged flowers borne in a dense raceme on an erect, purple stem in late summer
C. takesimana is a vigorously-spreading perennial, forming clumps to 75cm high and wide. Branched stems bear heart-shaped, glossy leaves, up to 8cm long, and in summer, bell-shaped, drooping flowers are borne on arching stems. The flowers are a creamy-white colour flushed with pink and have fine dark red speckles on the inner petal surfaces
'Mollie Rilstone' is a strongly-scented, large flowered, Spencer cultivar with a cream ground and a pale-pink, picotee edge; the flower begins to open before the colours pale. Height 1.5-2.5m
'Desert Sun' is an upright, clump-forming perennial, to 80cm tall, with palmately-divided green leaves and, in summer, spikes of creamy-white buds opening to scented, yellow flowers
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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.