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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. 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. 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
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
H. forrestii is a small, semi-evergreen shrub with ovate leaves which turn orange and red in winter. Flowers saucer-shaped, to 5cm in width, clear yellow
H. perforatum is an upright perennial with small, ovate leaves and terminal clusters of star-shaped yellow flowers 1.5cm across
'Hidcote' is a small bushy semi-evergreen shrub with narrowly ovate leaves. Flowers saucer-shaped, to 7.5cm in width, bright yellow with orange anthers
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