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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.
'Corky' is a compact perennial making a clump to 70cm in height, with grassy foliage and open trumpet-shaped lemon yellow flowers, 6cm in width, with mahogany stalks
'Earthwalker' is strong, vigorous annual, up to 3m high, with coarse green leaves and abundant, multi-headed flowers, in late summer, with dark brown centres and ray florets which may be rich yellow, terracotta orange, dark red or warm brown
'Giotto' is an erect herbaceous perennial to 1.5m in height, with divided foliage and erect spikes of deep blue and violet, semi-double flowers 7cm across, with pale brown eyes
'Goldsturm' is an herbaceous perennial forming a clump to 60cm in height, with erect stems bearing narrowly ovate leaves and dark-eyed, deep yellow flowers to 12cm across
B. albosinensis var. septentrionalis is a medium-sized deciduous tree of open habit, with peeling coppery-pink or orange bark. Leaves oval, turning yellow in autumn. Flowers in slender brown catkins
B. nigra is a bushy deciduous tree to 15m or more, with peeling bark, at first reddish-brown, later almost black; glossy dark green leaves turn yellow in autumn
N. obliqua is a large, deciduous, fast-growing tree to 20m or more, with alternate leaves in two opposite rows, ovate, shortly toothed, 4-7cm long, dark green above, pale glaucous below, colouring yellow and crimson in autumn
'Celebration' is an erect perennial with spikes to 65cm long, and numerous side branches, bearing semi-double pale cream flowers 7cm across, with grey-brown eyes
'Variegata' is a semi-evergreen or deciduous sedge forming a spreading clump of broadly linear, grass-like leaves which are bright green, edged and striped with creamy-white; small brown flower-spikes open before the new leaves in early spring
'Aurea' is a large, conical, deciduous tree with yellow-green leaves. Conspicuous male catkins, to 10cm long, appear in spring. The smaller female catkins are followed by small, cone-like fruit that turn dark brown in autumn and persist into winter
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