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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.
H. × moserianum is a spreading dwarf deciduous shrub with arching red stems and ovate leaves. Flowers to 5cm in width, golden-yellow with reddish anthers
H. addingtonii is a medium-sized, semi-evergreen shrub to about 2m in height and spread, with arching branches displaying pairs of papery, oval leaves arranged all in one plane. Golden-yellow, bowl-shaped flowers ,up to 5cm across, appear singly or in small clusters near the ends of branches in summer
H. monogynum is a small, semi-evergreen shrub to about 80cm, with narrow, more or less evergreen leaves and small sprays of golden-yellow, 6cm wide flowers with conspicuous golden stamens from summer to autumn
H. olympicum f. minus is a dwarf, deciduous, prostrate or erect subshrub to 30cm tall with narrowly elliptic, glaucous-green leaves 3-4cm long. Bright yellow flowers are borne in small clusters at the ends of shoots in the summer
H. kouytchense is a small semi-evergreen shrub with ovate leaves. Flowers golden yellow, to 6cm in width, with long stamens, followed by attractive reddish capsules in autumn
H. olympicum is a dwarf, deciduous sub-shrub to 25cm in height, with erect stems crowded with small ovate, grey-green leaves. Flowers to 5cm in width, bright yellow, in small clusters
H. aegypticum is a dwarf, evergreen, branching and spreading shrub to 30cm tall with ovate, grey-green leaves 30-80mm long. Solitary, golden-yellow flowers up to 1cm in diameter are borne at the end of short stems in summer
H. lancasteri is a spreading, deciduous shrub with paired leaves to 6cm, bronze when young. In summer bears sprays of shallowly cup-shaped, golden-yellow flowers to 6cm across, preceded by conspicuous, red-edged calyces, opening in a star-shape
'Gold Cup' is a bushy shrub up to 1.5m high, with arching branches and deciduous, lance-shaped, mid-green leaves, up to 8cm long, and pyramidal cymes of up to nine cup-shaped, golden yellow flowers, 5-6cm across, in summer; bees may visit the flowers for pollen
H. subsessile is a deciduous shrub to about 1.2m, with upright to arching shoots and narrow, oval leaves. Bright yellow, cup-shaped flowers, sometimes flushed red in bud, have conspicuous stamens and are followed by dark red, dry, berry-like fruits from late summer
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