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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.
P. padus is a large deciduous tree with toothed, ovate leaves turning yellow in autumn, and pendant racemes of frgrant white flowers 1cm wide in late spring, followed by small, bitter black fruits
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
A. unedo is a large evergreen shrub of bushy habit, with rough brown bark and dark green leathery leaves. Flowers urn-shaped, white, appearing as the strawberry-like red fruits, from the previous years flowers, ripen
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
S. lancastriensis is a deciduous shrub or small tree to about 6m, endemic to the UK and only found in a small area around Morecambe Bay. The oval leaves are felted white beneath, shiny, mid-green above, with clearly marked veins. Creamy white blossom in spring is followed by bright orange-red berries
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
S. domestica is a tree, up to 20m high, with a domed, open crown and level, spreading branches and orange-tinged brown bark which cracks into small rectangles. Pinnate leaves, 15-22cm long, with 13-21 oblong, partly-serrated, dark yellowish-green leaflets, turn orange-red or yellow in autumn. Domed clusters, about 10cm across, of greyish-cream flowers appear in early summer and are followed by green fruits, 2-3cm long, which are tinged brownish-red on the sunny side and shaped like small apples or pears, in late summer and early autumn
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
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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.