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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.
'Yellow Wilgenbroed' is an evergreen perennial to 60cm with erect stems and palmately-divided leaves with narrow leaflets, yellow-green at first, maturing to bright green. Nodding, bell-shaped, yellow-green flowers are produced in large, open clusters from mid-winter to mid-spring
'Pretty Ellen Pink' is a semi-evergreen, clump-forming perennial to 35cm tall with dark green, divided leaves. Upright flower stems bear flowers in late winter and early spring with pink-white petals spotted within
Blackthorn Group are evergreen perennials to 45cm with purplish biennial stems bearing leaves composed of three bluish-green, pale-veined leaflets. Nodding, pale pinkish-green flowers 3-5cm in width are borne in open clusters
'Winter Sunshine' is a clump-forming, semi-evergreen herbaceous perennial, up to 45cm high, with glossy dark olive-green leaves with pewter-grey veins. The large flowers, appearing from late winter to early spring, have green centres and long creamy stamens, the petals opening creamy-white and becoming pinkish-red with age
Wester Flisk Group are evergreen perennials to 80cm with erect stems and palmately-divided leaves with narrow, dark green leaflets. All stems are flushed with dark red, which suffuses into the leaf bases. Nodding, usually purple-edged, pale green flowers, to 2cm in width, are borne in large open clusters from midwinter to mid-spring
H. x ericsmithii is a hybrid between H. x sternii and H. niger. Large white flowers, tinged pink, are produced on pink stems above toothed leaves that are green with white veins and a metallic sheen. Height to 35cm
'Potter's Wheel' is a clump-forming herbaceous perennial, up to 30cm high, with dark green overwintering leaves. Bowl-shaped, rounded flowers, 10-13cm across, with overlapping pure white petals, distinct green centres, and golden-yellow stamens, appear from early winter to early spring
'Tutu' is a clump-forming, semi-evergreen herbaceous perennial, up to 45cm high, with glossy, mid-green leaves and pink flowers, with dark pink-red semi-double anemone-centres, from late winter to spring
Harvington yellow speckled is an evergreen perennial with divided, glossy, dark green leaves and upright, branched stems bearing nodding or outward-facing yellow flowers, with a flush of purple speckles, in late winter and early spring
'Winter Moonbeam' is an evergreen perennial forming a low mound to 35cm, its dark green leaves marked with silver-grey veins. From late winter into early spring, single, white, outward-facing flowers are borne on short stems; flowers age to pink and then a red colour
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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.