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Red Oak (Quercus rubra)

The Northern Red Oak is a native of North America , in the northeastern United States and southeast Canada . It grows from the north end of the Great Lakes , east to Nova Scotia , south as far as Georgia and states with good soil that is slightly acidic . Often simply called "Red Oak", northern red oak is formally so named to distinguish it from southern red oak ( Q. falcata ), also known as the Spanish oak.

In forests, the northern red oak grows straight and tall, to 28 m (90 ft), exceptionally to 43 m (140 ft) tall, with a trunk of up to 50-100 cm (20-40 in) diameter. Open-grown trees do not get so tall, but can develop a stouter trunk, up to 2 m (6 ft) in diameter. It has stout branches growing at right angles to the stem, forming a narrow round-topped head. It grows rapidly and is tolerant of many soils and varied situations, although it prefers the glacial drift and well-drained borders of streams.

DESCRIPTION

Under optimal conditions, northern red oak is fast growing and a 10-year-old tree can be 5-6 m (15-20 ft) tall. Trees may live up to 500 years according to the USDA , and a living example of 326 years was noted in 2001 by Orwig et al.

Northern red oak is easy to recognize by its bark, which feature bark ridges that appear to have shiny stripes down the center. A few other oaks have bark with this kind of appearance in the upper tree, but the northern red oak is the only tree with the striping all the way down the trunk.

- Bark:Dark reddish grey brown, with broad, thin, rounded ridges, scaly. On young trees and large stems, smooth and light gray. Rich in tannic acid. Branchlets slender, at first bright green, shining, then dark red, finally dark brown. Bark is brownish gray, becoming dark brown on old trees.

- Wood: Pale reddish brown, sapwood darker, heavy, hard, strong, coarse-grained. Checks in drying, but when carefully treated could be successfully used for furniture. Also used in construction and for interior finish of houses. Sp. gr., 0.6621; weight of cu. ft., 41.25 lbs.

- Winter buds: Dark chestnut brown (reddish brown), ovate, acute, generally 6 mm long

- Leaves: Alternate, seven to nine-lobed, oblong-ovate to oblong, five to ten inches long, four to six inches broad; seven to eleven lobes tapering gradually from broad bases, acute, and usually repandly dentate and terminating with long bristle-pointed teeth; the second pair of lobes from apex are largest; midrib and primary veins conspicuous. Lobes are less deeply cut than most other oaks of the red oak group (except for black oak which can be similar). Leaves emerge from the bud convolute, pink, covered with soft silky down above, coated with thick white tomentum below. When full grown are dark green and smooth, sometimes shining above, yellow green, smooth or hairy on the axils of the veins below. In autumn they turn a rich red, sometimes brown. Often the petiole and midvein are a rich red color in midsummer and early autumn, though this is not true of all red oaks. Petioles year, about 18 months after pollination ; solitary or in pairs, sessile or stalked; nut oblong-ovoid with broad flat base, full, with acute apex, one half to one and one-fourth of an inch long, first green, maturing nut-brown; cup, saucer-shaped and shallow, 2cm (0.8 in) wide, usually covering only the base, sometimes one-fourth of the nut, thick, shallow, reddish brown, somewhat downy within, covered with thin imbricated reddish brown scales. Kernel white and very bitter. Despite this bitterness, they are eaten by deer, squirrels and birds .

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