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Botanical Name : Betula nigra
Species: B. nigra
Synonyms: Betula americana, Betula lanulosa, Betula rubra.
Habitat: Betula nigra is native to the Eastern United States from New Hampshire west to southern Minnesota, and south to northern Florida and west to Texas. It grows on the banks of streams, by swamps etc, in deep rich soil that is often inundated for weeks at a time.
Betula nigra is a deciduous tree growing to 25–30 meters (82–98 ft) with a trunk 50 to 150 centimeters (20 to 59 in) in diameter, often with multiple trunks. The bark is variable, usually dark gray-brown to pinkish-brown and scaly, but in some individuals, smooth and creamy pinkish-white, exfoliating in curly papery sheets. The twigs are glabrous or thinly hairy. The leaves are alternate, ovate, 4–8 centimeters (1.6–3.1 in) long and 3–6 centimeters (1.2–2.4 in) broad, with a serrated margin and five to twelve pairs of veins. The flowers are wind-pollinated catkins 3–6 centimeters (1.2–2.4 in) long, the male catkins pendulous, the female catkins erect. The fruit is unusual among birches in maturing in late spring; it is composed of numerous tiny winged seeds packed between the catkin bracts.
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Landscape Uses:Firewood, Pest tolerant, Specimen, Woodland garden. Succeeds in a well-drained loamy soil in a sheltered position. Grows well in heavy clay soils. Likes its roots within reach of water. Dislikes wet soils according to another report. Shade tolerant. Hybridizes freely with other members of this genus. A good plant to grow near the compost heap, aiding the fermentation process. Trees are notably susceptible to honey fungus. Special Features: Attracts birds, North American native, Attracts butterflies, Inconspicuous flowers or blooms.
Seed – best sown as soon as it is ripe in a light position in a cold frame. Only just cover the seed and place the pot in a sunny position. Spring sown seed should be surface sown in a sunny position in a cold frame. If the germination is poor, raising the temperature by covering the seed with glass can help. When they are large enough to handle, prick the seedlings out into individual pots and grow them on in a cold frame for at least their first winter. Plant them out into their permanent positions in late spring or early summer, after the last expected frosts. If you have sufficient seed, it can be sown in an outdoor seedbed, either as soon as it is ripe or in the early spring – do not cover the spring sown seed. Grow the plants on in the seedbed for 2 years before planting them out into their permanent positions in the winter.
Sap – raw or cooked. A sweet flavour. Harvested in early spring, before the leaves unfurl. The trunk is tapped by drilling a hole about 6mm wide and about 4cm deep. The sap flows best on warm sunny days following a hard frost. It makes a refreshing drink and can also be concentrated into a syrup or sugar. The sap can be fermented to make birch beer or vinegar. An old English recipe for the beer is as follows:- “To every Gallon of Birch-water put a quart of Honey, well stirr’d together; then boil it almost an hour with a few Cloves, and a little Limon-peel, keeping it well scumm’d. When it is sufficiently boil’d, and become cold, add to it three or four Spoonfuls of good Ale to make it work…and when the Test begins to settle, bottle it up . . . it is gentle, and very harmless in operation within the body, and exceedingly sharpens the Appetite, being drunk ante pastum.”
A salve was made by boiling the buds until they were thick and pasty, sulphur was added and this was then applied externally to skin sores and ringworm. The leaves have been chewed, or used as an infusion, in the treatment of dysentery. An infusion of the bark has been used to treat stomach problems, ‘milky’ urine and difficult urination with discharge. The German Commission E Monographs, a therapeutic guide to herbal medicine, approve Betula species for infections of the urinary tract, kidney and bladder stones, rheumatism.
Besom; Soil stabilization; Wood.
Young branches are used to make besoms, whisks etc. This species has an extensive root system and is sometimes planted for erosion control along the banks of streams. Wood – light, strong, close grained and hard, but it contains many knots because of the numerous branches along the trunk. It weighs 36lb per cubic foot. Of little use commercially, though it is sometimes used for furniture, turnery etc.
While its native habitat is wet ground, it will grow on higher land, and its bark is quite distinctive, making it a favored ornamental tree for landscape use. A number of cultivars with much whiter bark than the normal wild type have been selected for garden planting, including ‘Heritage’ and ‘Dura Heat’; these are notable as the only white-barked birches resistant to the bronze birch borer Agrilus anxius in warm areas of the southeastern United States of America.
Known Hazards :The aromatic and aliphatic hydrocarbons in birch tar are irritating to the skin. Do not use in patients with oedema or with poor kidney or heart functions.
Disclaimer : The information presented herein is intended for educational purposes only. Individual results may vary, and before using any supplement, it is always advisable to consult with your own health care provider.