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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.
'Pseudoturneri' is a spreading, dome-shaped, semi-evergreen tree with an ultimate height and spread of 20m. Leaves are dark green, about 10cm long and have a few shallow, rounded teeth. The flowers are inconspicuous yellow and green catkins, followed by clusters of narrow, 2cm long acorns
'Hungarian Crown' is a vigorous large deciduous tree with a massive, rounded crown and boldly lobed leaves to 20cm in length, colouring well in autumn. Flowers inconspicuous, greenish
'Splendens' is a large deciduous tree forming a tall, rounded crown of deeply-lobed glossy dark green leaves to 18cm long, turn bright scarlet and crimson in autumn. Yellow-green catkins in clusters
Q. cerris is a fast-growing, spreading, deciduous, very variable tree to 30m. The narrow, dark green leaves typically have deep, pointed lobes, the acorns are up to 4cm long, and the cups covered in shaggy scales
Q. frainetto is a fast-growing, spreading, deciduous tree, eventually reaching 30m. The dark green leaves are up to 20cm long, with numerous rounded lobes, and turn yellow-brown in autumn. The greenish flowers are inconspicuous catkins, followed by small clusters of acorns about 2cm long, in hairy cups
Q. ilex is a large evergreen tree with black, finely cracked bark, developing a massive, rounded crown. Glossy dark green, ovate leaves, whitish beneath contrast with whitish young foliage and yellow catkins
'Koster' is a fastigiate form with upright branches, spreading with age to ultimately reach 15m high and wide. Usually seed-raised so can be variable. Leaves are dark green with shallow lobes
Q. palustris is a strong-growing large deciduous tree with a dense, slightly pendulous crown. Deeply lobed eaves to 15cm, with whisker-tipped teeth, turn reddish-brown or bright crimson in autumn
Q. petraea is a large deciduous tree forming a broad, rounded crown, with rather leathery, dark green, lobed leaves to 15cm long, turning orange-brown in autumn. Inconspicuous yellowish flowers in catkins with the young leaves
Q. robur is a large deciduous tree developing a magnificent, broad crown, the leaves with shallow, rounded lobes, turning reddish-brown in autumn. Inconspicuous yellow-green catkins among the young leaves
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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.