Oak galls are excrescences that are sometimes produced in great numbers on the tree and are caused by the activity of the larvae of different insects. The insects live inside these galls, obtaining their nutrient therein. When the insect pupates and leaves, the gall can be used as a rich source of tannin, that can also be used as a dyestuff. Tannin is obtained from the bark. A reddish-brown dye can be obtained from the bark.Wood - coarse-grained, hard, strong, heavy, not durable. It weighs 41lb per cubic foot. An important lumber source in America, it is highly valued for flooring, furniture, veneer, construction etc.
The bark contains tannins, experimentally these have been shown to be antiviral, antiseptic, anticancer and also carcinogenic.Any galls produced on the tree are strongly astringent and can be used in the treatment of haemorrhages, chronic diarrhoea, dysentery etc.
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Prefers a hotter summer than is usually experienced in Britain, but trees still grow well in Britain. A fairly fast-growing tree, it is cultivated for its timber in C. Europe. Trees normally require 20 - 25 years to reach flowering size, and may take another 20 years before heavy crops of seed are produced. Seed production is cyclic, heavy crops being produced every 2 - 5 years in the wild. The tree flowers on new growth produced in spring, the seed taking two summers to ripen. Trees are able to regenerate from root suckers if the top is killed by a forest fire. Intolerant of root disturbance, trees should be planted in their permanent positions whilst young. Hybridizes freely with other members of the genus.Plants in this genus are notably resistant to honey fungus.
Problems, pests & diseases
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