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Wednesday, May 23, 2012

Street Trees Through the Seasons - Upright English Oak

Quercus robur ‘Fastigiata’ (Upright English Oak) is a variety of the species that is native to central and northeastern United States and southern Canada.
The tree is deciduous, and key diagnostics include a distinct upright columnar form, with many small, twiggy side branches. Leaves are alternate, simple, 3-4” by 1-2”, oval, dark green, with little or no stem, distinctly scalloped edges, persisting well into winter with orange to tan fall color. Acorns are brown, oval, with flattened, rounded ends and a short blunt nib and cup scales forming a fat warty surface over half the nut. Bark is dark brown, furrowed, with shallow, flat, peeling ridge plates.
Quercus robur 'Fastigiata' - leaves and form.

Quercus robur‘ Fastigiata’ requires little care once established, but does best in good soil.

Winter - bare, ascending branches reveal the upright columnar shape.
Spring - fresh, green, densely clustered leaves.
Summer - attractive foliage and form under the hot Dublin sun.
Fall - leaves turn bronzy orange.

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