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Uses

Edible uses

Notes

Seed - cooked[1]. The seed has been used as a staple food by some native North American Indian tribes[1]. Somewhat sweet[2][3][4][5]. A good size, to 25mm long and wide[6][7]. It can be dried, ground into a powder and used as a thickening in stews etc or mixed with cereals for making bread. The seed from some trees contains bitter tannins, these can be leached out by thoroughly washing the seed in running water though many minerals will also be lost. Either the whole seed can be used or the seed can be dried and ground it into a powder. It can take several days or even weeks to properly leach whole seeds, one method was to wrap them in a cloth bag and place them in a stream. Leaching the powder is quicker. A simple taste test can tell when the tannin has been leached. The traditional method of preparing the seed was to bury it in boggy ground overwinter. The germinating seed was dug up in the spring when it would have lost most of its astringency. The roasted seed is a coffee substitute.

Unknown part

Material uses

A mulch of the leaves repels slugs, grubs etc, though fresh leaves should not be used as these can inhibit plant growth[8].

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[3]. The branches have been used to make rims for twined work baskets[1]. The acorn meal has been used to mend cracks in clay pots[1]. The seed cups are used as buttons[9].

Wood - hard, heavy, strong, brittle. It has a strong cross-grain and is difficult to split[10]. Of little commercial value, it is used mainly for fuel[6][10].

Medicinal uses(Warning!)

Any galls produced on the tree are strongly astringent and can be used in the treatment of haemorrhages, chronic diarrhoea, dysentery etc[3]. A poultice of the ground galls and salt has been used in the treatment of burns, sores and cuts[1]. It has also been used as a wash for sore eyes[1]. The leaves have been chewed as a treatment for sore throats[1].

Unknown part

Ecology

Ecosystem niche/layer

Canopy

Ecological Functions

Nothing listed.

Forage

Nothing listed.

Shelter

Nothing listed.

Propagation

Seed - it quickly loses viability if it is allowed to dry out. It can be stored moist and cool overwinter but is best sown as soon as it is ripe in an outdoor seed bed, though it must be protected from mice, squirrels etc. Small quantities of seed can be sown in deep pots in a cold frame. Plants produce a deep taproot and need to be planted out into their permanent positions as soon as possible, in fact seed sown in situ will produce the best trees[11]. Trees should not be left in a nursery bed for more than 2 growing seasons without being moved or they will transplant very badly.

Practical Plants is currently lacking information on propagation instructions of Quercus douglasii. Help us fill in the blanks! Edit this page to add your knowledge.



Cultivation

Prefers a good deep fertile loam which can be on the stiff side[12][11]. Young plants tolerate reasonable levels of side shade[7]. Tolerates moderate exposure, surviving well but being somewhat stunted[7].

Prefers warmer summers than are usually experienced in Britain, trees often grow poorly in this country and fail to properly ripen their wood resulting in frost damage overwinter[7]. A slow-growing but long-lived tree. Seed production is cyclic, a year of high yields being followed by 2 - 4 years of low production[10]. The tree flowers on new growth produced in spring, the seed ripening in its first year[7][10]. This species is notably resistant to honey fungus[13][7]. Hybridizes freely with other members of the genus[7].

Intolerant of root disturbance, trees should be planted in their permanent positions whilst young[11].

Crops

Problems, pests & diseases

Associations & Interactions

There are no interactions listed for Quercus douglasii. Do you know of an interaction that should be listed here? edit this page to add it.

Polycultures & Guilds

There are no polycultures listed which include Quercus douglasii.

Descendants

Cultivars

Varieties

None listed.

Subspecies

None listed.

Full Data

This table shows all the data stored for this plant.

Taxonomy
Binomial name
Quercus douglasii
Genus
Quercus
Family
Fagaceae
Imported References
Edible uses
Medicinal uses
Material uses & Functions
Botanic
Propagation
Cultivation
Environment
Cultivation
Uses
Edible uses
None listed.
Material uses
None listed.
Medicinal uses
None listed.
Functions & Nature
Functions
Provides forage for
Provides shelter for
Environment
Hardiness Zone
7
Heat Zone
?
Water
moderate
Sun
full sun
Shade
light shade
Soil PH
Soil Texture
Soil Water Retention
Environmental Tolerances
  • Strong wind
Ecosystems
Native Climate Zones
None listed.
Adapted Climate Zones
None listed.
Native Geographical Range
None listed.
Native Environment
None listed.
Ecosystem Niche
Root Zone Tendancy
None listed.
Life
Deciduous or Evergreen
Herbaceous or Woody
Life Cycle
Growth Rate
Mature Size
Fertility
?
Pollinators
Flower Colour
?
Flower Type

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"image:Large Blue Oak.jpg|248px" cannot be used as a page name in this wiki.

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References

  1. ? 1.01.11.21.31.41.51.61.71.81.9 Moerman. D. Native American Ethnobotany Timber Press. Oregon. ISBN 0-88192-453-9 (1998-00-00)
  2. ? 2.02.1 Elias. T. and Dykeman. P. A Field Guide to N. American Edible Wild Plants. Van Nostrand Reinhold ISBN 0442222009 (1982-00-00)
  3. ? 3.03.13.23.33.43.5 Grieve. A Modern Herbal. Penguin ISBN 0-14-046-440-9 (1984-00-00)
  4. ? 4.04.1 Tanaka. T. Tanaka's Cyclopaedia of Edible Plants of the World. Keigaku Publishing (1976-00-00)
  5. ? 5.05.1 Yanovsky. E. Food Plants of the N. American Indians. Publication no. 237. U.S. Depf of Agriculture. ()
  6. ? 6.06.16.26.36.4 Sargent. C. S. Manual of the Trees of N. America. Dover Publications Inc. New York. ISBN 0-486-20278-X (1965-00-00)
  7. ? 7.07.17.27.37.47.57.67.77.8 Huxley. A. The New RHS Dictionary of Gardening. 1992. MacMillan Press ISBN 0-333-47494-5 (1992-00-00)
  8. ? 8.08.1 Riotte. L. Companion Planting for Successful Gardening. Garden Way, Vermont, USA. ISBN 0-88266-064-0 (1978-00-00)
  9. ? 9.09.1 Mabey. R. Food for Free. Collins ISBN 0-00-219060-5 (1974-00-00)
  10. ? 10.010.110.210.310.4 Elias. T. The Complete Trees of N. America. Field Guide and Natural History. Van Nostrand Reinhold Co. ISBN 0442238622 (1980-00-00)
  11. ? 11.011.111.211.3 Bean. W. Trees and Shrubs Hardy in Great Britain. Vol 1 - 4 and Supplement. Murray (1981-00-00)
  12. ? F. Chittendon. RHS Dictionary of Plants plus Supplement. 1956 Oxford University Press (1951-00-00)
  13. ? RHS. The Garden. Volume 112. Royal Horticultural Society (1987-00-00)

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