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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.
'Blue Eclipse' is a medium-sized deciduous climber, up to 3 metres high, with divided green leaves and large bell-like flowers of deep blue with a white edge on the outside and white inside, followed by fluffy seedheads
'Edward Prichard' is an erect to scrambling, non-clinging, relatively low-growing herbaceous cultivar reaching heights of 1 to 2m. The highly-scented flowers, up to 4cm across, are creamy-white with light purple tips and are borne in profusion through the summer and early autumn
'Bill MacKenzie' is a large, vigorous deciduous climber with finely-cut leaves. Flowers 6-7cm in width with four thick, spreading bright yellow sepals surrounding dark stamens from early to late summer. Good silky seed-heads
C. serratifolia is a deciduous climber up to 3m high with green leaves and scented, soft yellow flowers, 2.5 cm long, with purple stamens in late summer and early autumn, followed by silky seedheads
Princess Kate is a deciduous climber of herbaceous habit with profuse flowers once established. The single, 6 x 4 cm, lily-shaped flowers are very distinctive being coloured white on the inside and dark pink with a white margin on the outside; dark-pink stamens form an attractive cluster at the centre. Flowers from mid summer to early autumn
'Perle d'Azur' is a vigorous deciduous extremely floriferous climber with 10-12.5cm wide clear, pale-blue flowers with the midrib of each petal flushed purple near the base and a hint of pink on the central bars, opening from mid summer to early autumn
Crystal Fountain is a free-flowering, deciduous climber, to 1.8m in height, with mid-green ovate leaves. The stunning violet-blue flowers have a fountain-like centre of silvery-mauve petaloid stamens and are borne from late spring to early summer and again in late summer to early autumn
Anna Louise is a deciduous climber blooming in late spring to early summer and again in late summer to early autumn. The flowers are open stars, 15-20cm across, with six blue-purple sepals with a central cerise stripe, and cream stamens with a cerise stripe on each anther
Arctic Queen is a medium-sized deciduous climber. A profusion of double flowers to 15cm across are clear creamy-white with pale yellow anthers. Flowers from early summer to early autumn
Golden Tiara is a vigorous deciduous climber with pinnately divided leaves. Deep yellow flowers 3-4cm across, with conspicuous purple stamens. Flowers early to late summer followed by silky seedheads
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