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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.
'Gilt Edge' is an evergreen tree of dense, broadly columnar habit, with dark green, oblong leaves with a fine, pale yellow border, and saucer-shaped white flowers, 5cm across, in early to mid-summer
Black Tulip is a vigorous, upright, open-branched, deciduous tree with oval leaves up to 15cm long. Before the leaves open, from early to mid-spring, it produces abundant, cup-shaped, rich red-purple flowers, 15cm or more across, with rounded petals
'Hearts of Gold' is a deciduous, often multi-stemmed, tree with a rounded-crown reaching a height of 5m and spread of 6m. The heart-shaped leaves emerge orange-red in spring, turning a bright gold-yellow in full sun and maturing to a yellow-green colour. Clusters of small, pea-like, rose-purple flowers are borne on bare branches in the spring before the foliage emerges
S. aucuparia var. xanthocarpa is a medium-sized deciduous tree with a spreading crown and pinnate leaves turning yellow to red in autumn. Flattened clusters of creamy-white flowers followed by orange-yellow fruits
H. angustifolia is a slender shrub or small tree of columnar habit, to 8m, with abundant small twigs bearing small, leathery leaves. Juvenile plants are dense and bushy with slender, interlacing branches and tiny leaves. The small flowers are 2cm across and creamy-white, produced in abundance in summer
'Donard Gold' is a narrowly conical evergreen tree with bright yellow foliage, colouring best in full sun
Venus is a vigorous, spreading deciduous tree up to 6m tall and 4m wide. Glossy green, oval to egg-shaped leaves turn attractive shades of yellow, red, orange and purple in autumn. In spring, established trees bear a profusion of small, dense, green flowerheads surrounded by showy, large creamy-white bracts up to 15cm across. These may be followed in autumn by raspberry-like red fruits
'Umineko' is an upright tree with pale green young foliage, later dark green, and single white flowers 4cm across in spring
E. coccineum is an upright evergreen shrub or small tree, with leathery, lance-shaped leaves and clusters of narrowly tubular scarlet flowers in late spring and early summer
'Adamii' is a small spring-flowering deciduous tree with some branches bearing foliage and yellow flowers of common laburnum, others those of purple broom, and many intermediate dull yellowish-pink flowers
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