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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
'Lady Northcliffe' is a climber 1.5-3m high with green leaves and flowers 10-15cm across, composed of usually six overlapping, wide, broadly elliptic, wavy-edged sepals, rich violet-blue at first then fading to mid lavender-blue, and creamy stamens, from midsummer to early autumn and sometimes later; many clematis are visited by bees for pollen, and some also provide nectar
'Helios' is a deciduous climber, 1-2.2m in height, with opposite green leaflets on twining leaf-stalks. Bright yellow, coconut-scented, nodding flowers start lantern-shaped and then open to flattened stars; borne from summer through into autumn and followed by fluffy, silver seedheeds in 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
'Blue Light' is a climber 2-2.5m high with green leaves and pale violet-blue flowers, 11-15cm across, with creamy yellow stamens; the flowers are semi-double in early summer, and semi-double or single, with six sepals and blue veins, in late summer and early autumn.
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