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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.
M. sylvestris is a small, rounded tree with ovate leaves and clusters of pink-tinged white flowers to 5cm across in late spring, followed by yellow-green, sometimes red-flushed fruits 2-3cm across
C. monogyna is a small, rounded deciduous tree with glossy, deeply lobed leaves and flat sprays of cream flowers, followed by dark red berries in autumn
T. cordata is a medium-sized deciduous tree with a spreading or rounded crown, and glossy dark green, heart-shaped leaves to 8cm in length, turning yellow in autumn. Small, fragrant creamy-white flowers are borne in spreading clusters in summer
A. glutinosa is a deciduous tree to 25m, broadly conical in habit when young, with grey-purple buds and young catkins conspicuous in winter, and rounded bright green leaves
P. tremula is a large deciduous tree with a broad crown, sometimes suckering freely. Rounded leaves, bronze when young, tremble in a light breeze and turn yellow in autumn. Male trees have woolly grey catkins
R. cathartica is a bushy, deciduous shrub or small tree to 6m, with spiny shoots bearing glossy dark green leaves which turn yellow in autumn, and small clusters of tiny yellowish flowers followed by red berries which ripen to black
S. viminalis is a fast-growing large shrub or small tree to 6m tall, with shiny greenish-yellow young shoots and narrow leaves that are silver-hairy beneath; slender greenish catkins open before the leaves, in late winter
S. pentandra is is a bushy deciduous tree to 10m tall, with glossy dark green leaves to 12cm long, and 5cm long catkins in early summer, the showy males yellow, the females green
S. cinerea subsp. oleifolia is a deciduous tree found in damp places. Twigs are yellow and red when young, bark attractively fissured in diamond patterns when mature. Leaves have an elongated oval shape with a grey sheen. Round, silvery male catkins with yellow pollen and female green catkins are borne on separate trees, to 10m in height
P. spinosa is a small thorny deciduous tree with dark green, ovate leaves, and small white flowers in early spring, followed by ovoid, bloomy black fruits 1.5cm across
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We're a UK charity established to share the best in gardening. We want to enrich everyone's life through plants, and make the UK a greener and more beautiful place.