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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.
'Aurea' is a slow-growing, large, deciduous tree with an open, spreading crown and large, lobed leaves which are bright yellow when young, turning green by midsummer. Yellow leaf colour is more pronounced when grown in an open position. Brown acorns are produced in autumn
'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
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
'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
'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
'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. rubra is a fast-growing large deciduous tree with an open, spreading crown and broad leaves to 22cm in length, turning red or red-brown in autumn. Flowers greenish, inconspicuous
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
'Hemelrijk' is a large, vigorous tree with brilliant red autumn colour. The leaves are a shiny, bright green, deeply lobed with each lobe narrowing to a fine point. They turn pinky-brown as they die and remain on the tree throughout the winter. The green and yellow flowers are inconspicuous catkins, followed by brown acorns with darker brown stripes, up to 2cm long in scaly cups
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