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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.
'Helen Robinson' is a dense, upright, spreading, evergreen perennial to 80cm tall. The neat, green leaf rosettes are covered in thick, soft hairs when young and the flowers, produced from mid-spring, are yellow-green with a red eye
'Elegans' is a vigorous climber with heart-shaped or 3 to 5-lobed leaves to 12cm long, heavily-mottled with white and pink. Branched clusters of small green flowers may appear in summer, followed by pinkish-purple berries that later turn blue
'Hill Poë' is a bulbous perennial, to 15cm tall, with grey-green leaves, double flowers, and a later flowering period than some cultivars. Its 4 to 5 outer petals are almost completely white and surround a double rosette of inner petals, marked with dark green at their tips and along their mid-section, and edged with white
E. repens var. pulchrum is a trailing evergreen perennial to 10cm high, with purple stems bearing attractive grey-mottled, dark green leaves, veined deeper green, and purple beneath. Flowers insignificant
D. lotus is a spreading, deciduous tree with glossy, dark green leaves up to 10cm long. Bears tiny, bell-shaped, greenish flowers in mid- to late summer followed, on female flowers and in a good summer, by yellow, orange or purple, plum-like but inedible fruit
H. lividus is an evergreen perennial to 45cm with biennial stems bearing leaves composed of three bluish-green marbled leaflets. Nodding, pale pinkish-green flowers 3-5cm in width are borne in open clusters from mid winter
'Ravensholst' is a vigorous, self-clinging large evergreen climber with triangular-ovate, glossy dark green leaves to 20cm in length, sometimes tinged purple in winter
'Rococo' is a parrot cultivar with puckered, thick tepals that are rich red with green feathering and a hint of yellow. Flowers in late spring
'Ben Lomond' is a blackcurrant for culinary or dessert use, to 1.5m in height. Flowers insignificant, pale green; fruit black, mid to late season
C. remota forms dense semi-evergreen tussocks of very thin, long, arching pale to bright green leaves. Drooping flower stems carry pale yellow-green flowers during early summer
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