Quercus - - Semi-mature and mature Quercus palustris

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Quercus palustris - Pin Oak, Swamp Oak

 

Family:

Fagaceae

Origins:

USA and South east Canada around the Great Lake Regions

Plant Type:

Deciduous tree

Size:

15 - 25m x 20m

Habit/ Form:

A single trunked conical to medium domed tree with many evenly spaced horizontal or pendulous branches, becoming broad domed with age.

Leaves:

Alternate, deeply and variably pinnatifid, with pointed lobes (each lobe ending in a short bristle) 100 - 150mm x 70 - 120mm, bright mid green, turning crimson / red in autumn, then turning brown. The brown leaves will stay on the tree till the new growth pushes them off in spring.

Flowers:

Inconspicuous among new growth in spring.

Fruit:

A globose acorn, 10 - 15mm high, dark brown with paler vertical stripes, the involucre (saucer) half covers the acorn, ripening in late summer and autumn.

Bark / Trunk:

Brownish / grey furrowed bark

Vigour / Longevity:

Slow to moderate, long lived

Environmental Requirements:

Sunny positions for the best autumn colour.

Hardiness:

Frost hardy to - 10°C, tolerates periodically wet soils, snow tolerant, tolerates neglect

Soil / Drainage:

Prefers deep moist, well drained soils, prefers to be near permanent water, rivers, etc.

Pruning:

Early training to establish a single leader and to lift the lower branches, if access is needed under the crown. As this tree matures it is usually self shaping but can tolerate hard pruning.

Watering:

Not drought tolerant, water in dry summers.

Fertilising:

Apply a complete fertiliser in late winter for spring growth, till established.

Pests / Diseases:

Oak Blotch Leaf Miner (less affected by leaf miner than Q. robur), Chlorosis in alkaline soils, treat with Iron Chelates.

Uses:

Autumn colour contrast tree, street tree, shade tree, avenue tree, golf course tree, (the hard bark is not damaged by the golf balls), river bank binder.

 

 

© Text reproduced here with the kind permission of Tony Wilson and Barck Books.

 

 

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