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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.
'Red Chief' is a vigorous, spiny medium-sized deciduous shrub, habit upright to spreading, with rather narrow, purple-red leaves, becoming brighter red in autumn. Flowers pale yellow, followed by deep red berries
'Red Pillar' is a spiny, deciduous shrub initially columnar, but spreading with age. The foliage is dark purple, turning red in autumn, and the yellow spring flowers are followed by small red berries
'Helmond Pillar' is a slow-growing cultivar with an upright habit, eventually reaching 1.5m in height. Small yellow flowers are borne in late spring, followed by red berries in the autumn; often persisting into winter. Foliage is brownish-red and deciduous; autumn leaf fall exposes the brown, thorny stems
'Harlequin' is a compact deciduous shrub with rounded deep purple leaves, variably splashed with cream and pink, and small pale yellow flowers followed by dark red berries
'Maria' is one of the best columnar golden-leaved cultivars, which keeps its colour and shape well all season; pale yellow flowers in spring
'Boum' is a compact, dwarf shrub with distinctive colouring. Flowers, as with most of the B. thunbergii cultivars, are pale yellow and relatively insignificant, but the leaves are variegated cream/green, contrasting with red stems. New shoots may be pink-flushed in all parts. Scarlet berries develop in autumn when the leaves also turn orange-red
'Golden Rocket' is an upright, deciduous, columnar shrub, to 1.5m tall and 0.6m wide, with bright green-yellow foliage. Small, pale yellow spring flowers are followed by scarlet berries
'Pink Lady' is a spiny, deciduous shrub to 1.5m, with deep purple leaves irregularly marbled with pink and white, sometimes turning red in autumn. Flowers sparse, small and yellow, followed by small red berries
'Atropurpurea Nana' is a deciduous dwarf shrub to 60cm, compact and bushy in habit, with spiny stems bearing purplish-red, obovate leaves, becoming brighter in autumn. Flowers small, pale yellow, followed by deep red berries
'Bagatelle' is a very compact spiny deciduous shrub of rounded habit, with obovate, purple leaves becoming brighter in autumn. Flowers pale yellow, followed by red berries
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