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Woody > Quercus > Quercus robur > Quercus robur

Quercus robur


English Oak




Origin:  Europe, Northern Africa and Western Asia.
            Mike's Opinion

this is Mike

"

This slow growing tree can survive for centuries. The largest English Oaks have decayed centers but are estimated at 1000 to 2000 years old.



Michael Pascoe, NDP., ODH., CLT., MSc. (Plant Conservation)

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Family
Fagaceae
Genus
Quercus
Species
robur
Category
Woody
Type
Tree (deciduous)
Pronunciation
USDA Hardiness Zone
5 - 8
Canadian Hardiness Zone
4a - 8a
RHS Hardiness Zone
H7 - H4
Temperature (°C)
(-26) - (-7)
Temperature (°F)
(-15) - 20
Height
12-23 m
Spread
12-23 m
Photographs
Description and Growing Information
Flowering Period
April
General Description
Large heavy branches, with a majestically domed crown and foliage set in bunches. This species has been placed on the IUCN Red List as least concern.
Landscape
In parts of Europe, it is planted along the axis and borders of public plazas, to provide shade and cool the air. However it is quite suited to North American landscapes as a ‘center piece’ or focal point within a landscape venue especially when the tree has grown significantly enough to make an impact.
Cultivation
Quercus robur is tolerant to a variety of soils, even heavy wet clays. However it prefers to grow out in the open or in a hedgerow. It responds well to bur lapping and containers in production, however one must note that it has deep tap roots.
Shape
Broadly rounded crown.
Growth
Slow
ID Characteristic
Distinctly large reddish acorns, and extremely short petioles. Undulate or wavy leaf edges.
Pests
Erysiphe alphitoides (Powdery mildew). Although powdery mildew is unattractive, it is rarely fatal to the oak, however it does put stress on the tree, and can interfere with photosynthesis and transpiration.
Habitat
Climax forests in England and Europe.
Bark/Stem Description
Ash-coloured, coarsely textured with black fissures and vertical ridges.
Flower/Leaf Bud Description
The terminal buds are rather large, measuring 1 cm in length, being a reddish brown colour. The bud scales themselves are somewhat fringed with hairs, when mature, they develop shallow grooves.
Leaf Description
Small undulate leaves, measuring 8-13 cm in length, with 5 to 7 pairs of subtly rounded lobes, as well as small earlike lobes at the base of the leaf.
Flower Description
Small, delicate, white and inflorescent in nature. They are arranged on the sides of thin dangling stems 4 cm long. The female flowers are solitary.
Fruit Description
The acorns of Quercus robur are approximately 2.5 cm in length, and are a third covered by a cap. They are suspended by a long (10 cm) peduncle and can be found in clusters of three to five.
Colour Description
Jade green on the upper surface with subtle hues of pastel green underneath. In the autumn the leaves turn a rich tan colour.
Texture Description
Relatively thin as far as leaves are concerned. The upper-epidermis feels like soft leather, the lower surface has a ‘cotton paper’ like feel.
Notable Specimens
University of Western Ontario, Sherwood Fox Arboretum, London, Ontario, Canada. Westonbirt, The National Arboretum, Tetbury, Gloucestershire, England.
Propagation
Commonly through seed, although the seed is reclacitrant (will not store).
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