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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.
Q. pontica is a slow-growing, deciduous shrub or small tree to 6m tall with a broadly oval head and stout, upright branches. Its large, oval, toothed leaves are strongly ribbed and up to 25cm long and 12cm wide; the bright green foliage turns yellow in autumn. Females flowers are inconspicuous whilst male flowers appear in showy, olive-yellow catkins; large acorns 2.5-4cm long are borne in clusters in autumn
'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
'Pinnatifida' is an upright, deciduous, slow-growing tree to around 10m tall. Spreading branches with stout stems bear dark green, obovate leaves that are deeply cut into narrow and pointed lobes. Young leaves emerge edged pink in spring and turn shades of orange and yellow in autumn. Greenish-yellow catkins in spring are followed by clusters of brown acorns about 2cm long
'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 approximately 20m high and 3m wide. Usually seed-raised so can be variable. Leaves are dark green with shallow lobes
Q. shumardii is a small to medium-sized, deciduous tree to 18m tall, initially pyramidal in habit but spreading to form a broad, open crown with age. Deeply-cut, glossy green leaves up to 20cm long with 7-9 lobes have conspicuous tufts of hairs in the vein axils on the undersides; leaves turn red or golden-brown in the autumn. Insignificant greenish flowers are followed in autumn by acorns, usually solitary and up to 2.5cm long
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
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