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Betula kenaica - W.H.Evans.

Kenai Birch

Author	W.H.Evans.	Botanical references	11, 82, 200
Family	Betulaceae	Genus	Betula
Synonyms	Betula papyrifera kenaica - (W.H.Evans.)Henry.
Known Hazards	None known
Range	North-western N. America - Alaska.
Habitat	Grows along the coast[11]. Rocky slopes in the subalpine zone from sea level to 300 metres[270].
Edibility Rating	3 (1-5)	Medicinal Rating	1 (1-5)

Physical Characteristics

A decidious Tree growing to 12m at a fast rate.

The plant prefers light (sandy), medium (loamy) and heavy (clay) soils, requires well-drained soil and can grow in heavy clay and nutritionally poor soils. The plant prefers acid, neutral and basic (alkaline) soils. It can grow in semi-shade (light woodland) or no shade. It requires moist soil.

Habitats

Woodland Garden; Canopy; Secondary;

Edible Uses

Edible Parts: Flowers; Inner bark; Leaves; Sap.

Edible Uses: Condiment.

Young leaves and catkins - raw[172]. The buds and twigs are used as a flavouring in stews[172]. Inner bark - raw or cooked. Best in spring[172]. Inner bark can be dried and ground into a powder and then used as a thickener in soups etc or added to flour when making bread, biscuits etc. Inner bark is generally only seen as a famine food, used when other forms of starch are not available or are in short supply[K]. Sap - raw or cooked[172]. It can be used as a refreshing drink, or can be concentrated by boiling to make a syrup[K]. It is tapped in late winter, the flow is best on sunny days following a heavy frost. The sap can be fermented into a beer. 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."[269].

Medicinal Uses

Antirheumatic; Astringent; Lithontripic; Salve; Sedative.

The bark is antirheumatic, astringent, lithontripic, salve and sedative[172].

Other Uses

Fuel; Hair; Kindling.

An infusion of the plant is used as a hair conditioner and dandruff treatment[172]. Wood - close-grained, light, strong, hard, tough[82]. It makes a good fuel[172], whilst the bark makes a good kindling[172].

Cultivation details

Succeeds in a well-drained loamy soil in a sunny position[11, 200]. Tolerates most soils including poor soils and heavy clays[200]. Fairly wind tolerant[200]. A fast-growing but short-lived species[200]. Hybridizes freely with other members of this genus[50]. A good plant to grow near the compost heap, aiding the fermentation process[20]. This plant is closely related to B. papyrifera, and possibly no more than a sub-species of that species[11, 200]. Trees are notably susceptible to honey fungus[200].

Propagation

Seed - best sown as soon as it is ripe in a light position in a cold frame[78, 80, 113, 134]. Only just cover the seed and place the pot in a sunny position[78, 80, 134]. Spring sown seed should be surface sown in a sunny position in a cold frame[113, 134]. If the germination is poor, raising the temperature by covering the seed with glass can help[134]. 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[78, 80, 113, 134].

Links

Permaculture.info Details of this plant in the Permaculture.info project, a community plant and permaculture database.

References

[K] Ken Fern
Notes from observations, tasting etc at Plants For A Future and on field trips.

[11] Bean. W. Trees and Shrubs Hardy in Great Britain. Vol 1 - 4 and Supplement. Murray 1981
A classic with a wealth of information on the plants, but poor on pictures.

[20] Riotte. L. Companion Planting for Successful Gardening. Garden Way, Vermont, USA. 1978 ISBN 0-88266-064-0
Fairly good.

[50] ? Flora Europaea Cambridge University Press 1964
An immense work in 6 volumes (including the index). The standard reference flora for europe, it is very terse though and with very little extra information. Not for the casual reader.

[78] Sheat. W. G. Propagation of Trees, Shrubs and Conifers. MacMillan and Co 1948
A bit dated but a good book on propagation techniques with specific details for a wide range of plants.

[80] McMillan-Browse. P. Hardy Woody Plants from Seed. Grower Books 1985 ISBN 0-901361-21-6
Does not deal with many species but it is very comprehensive on those that it does cover. Not for casual reading.

[82] Sargent. C. S. Manual of the Trees of N. America. Dover Publications Inc. New York. 1965 ISBN 0-486-20278-X
Two volumes, a comprehensive listing of N. American trees though a bit out of date now. Good details on habitats, some details on plant uses. Not really for the casual reader.

[113] Dirr. M. A. and Heuser. M. W. The Reference Manual of Woody Plant Propagation. Athens Ga. Varsity Press 1987 ISBN 0942375009
A very detailed book on propagating trees. Not for the casual reader.

[134] Rice. G. (Editor) Growing from Seed. Volume 2. Thompson and Morgan. 1988
Very readable magazine with lots of information on propagation. An interesting article on Ensete ventricosum.

[172] Schofield. J. J. Discovering Wild Plants - Alaska, W. Canada and the Northwest. 0
A nice guide to some useful plants in that area.

[200] Huxley. A. The New RHS Dictionary of Gardening. 1992. MacMillan Press 1992 ISBN 0-333-47494-5
Excellent and very comprehensive, though it contains a number of silly mistakes. Readable yet also very detailed.

[269] Duke. J. Handbook of Energy Crops - 1983
Published only on the Internet, excellent information on a wide range of plants.

[270] Flora of N. America 0
An on-line version of the flora with an excellent description of the plant including a brief mention of plant uses.

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