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Carya californica

Common name:	California Walnut	Family:	Juglandaceae
Author:	S.Watson.	Botanical references:
Synonyms:
Known Hazards:	None known
Range:	South-western N. America.
Habitat:	Not known
Edibility Rating (1-5):	2	Medicinal Rating (1-5):	0

Other Possible Synonyms:	From various places across the web, may not be correct. See below.
	Carex californica[B,CARICEAE,C,CAL,P]
Other Common Names:	From various places around the Web, may not be correct. See below.
	California Sedge [B,P],
Systematics:	From a USDA Plants Database
	Order: Juglandales. Walnut family

Physical Characteristics

A decidious tree growing to 9m. It is hardy to zone 8. It is in leaf from June to October, in flower from April to May. The flowers are monoecious (individual flowers are either male or female, but both sexes can be found on the same plant) and are pollinated by Wind. The plant is self-fertile. We rate it 2/5 for edibility and 0/5 for medicinal use.

The plant prefers light (sandy), medium (loamy) and heavy (clay) 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 and Possible Locations

Woodland, Canopy, Secondary.

Edible Uses

Seed.

Seed - raw or cooked. Sweet but with a thick shell, the seed is said to have a better flavour than Juglans nigra. It is also used in cakes, pies, biscuits etc[183]. The seed ripens in late autumn and, when stored in its shell in a cool place, will keep for at least 6 months[K].

Medicinal Uses

Disclaimer

None known

Other Uses

Rootstock.

This species is sometimes used as a rootstock for the common walnut, Juglans regia[183].

Cultivation details

Prefers a deep moisture-retentive loam in a sunny sheltered position, requiring a good summer for best development[1, 63, 137, 200]. Slow growing[200].
This species is not hardy in the colder areas of the country, it tolerates temperatures down to between -5 and -10°c[200].
Plants are strongly tap-rooted and should be planted in their permanent positions as soon as possible[1, 137]. Sowing in situ would be the best method so long as the seed could be protected from mice[1, 200].
Trees are late coming into leaf (usually late May to June) and lose their leaves early in the autumn (usually in October)[137]. During this time they cast a heavy shade. These factors combine to make the trees eminently suitable for a mixed woodland planting with shrubs and other trees beneath them[137].
Plants in this genus are notably resistant to honey fungus[200].
Most species in this genus have quite a wide range of distribution and, in order to find trees more suited to this country, seed from the most appropriate provenances should be sought[137]. Most trees growing in Britain at present tend to only produce good seed after hot summers[137].
This species is closely related to J. hindsii.
Trees are self-fertile but larger crops of better quality seeds are produced if cross-pollination takes place[229].

Propagation

Seed - requires a period of cold stratification. It is best sown in a cold frame as soon as it is ripe[78]. Stored seed should be kept moist (but not wet) prior to sowing and should be sown in a cold frame as soon as possible[78]. Where possible, sow 1 or 2 seeds only in each deep pot and thin to the best seedling. If you need to transplant the seedlings, then do this as soon as they are large enough to handle, once more using deep pots to accommodate the tap root. Put the plants into their permanent positions as soon as possible, preferably in their first summer, and give them some protection from the cold for at least the first winter[78, K]. Seed can also be sown in situ so long as protection is given from mice etc and the seed is given some protection from cold[200] (a plastic bottle with the top and bottom removed and a wire mesh top fitted to keep the mice out is ideal)

Suppliers

For more details of plant suppliers please see our Suppliers Page which lists many more places to look.

Web References

[HP] Links, Photos, Suppliers from Hortiplex Plant Database

References for Carex californica (a possible synonym).

[B] Data (Latin & Common names, other references) from the BONAP's Synonymized Checklist of the Vascular Flora of the United States, Puerto Rico, and the Virgin Islands.
[C] Taxon data. from the CalFlora database.
[P] Data. (uses, distribution, wetland) from the USDA'a Plants database.

References for the family Juglandaceae.

[CHINA] Data Very detailed botanical/identification info. from the Flora of China.

See the PFAF Links Pages for other sources.

Also try Photos and info from the The Plants Database which has 14,000 images.

References

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

[1] F. Chittendon. RHS Dictionary of Plants plus Supplement. 1956 Oxford University Press 1951
Comprehensive listing of species and how to grow them. Somewhat outdated, it has been replaces in 1992 by a new dictionary (see [200]).

[63] Howes. F. N. Nuts. Faber 1948
Rather old but still a masterpiece. Has sections on tropical and temperate plants with edible nuts plus a section on nut plants in Britain. Very readable.

[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.

[137] ? The Plantsman. Vol. 9. 1986 - 1987. Royal Horticultural Society 1986
Excerpts from the periodical giving cultivation details and other notes on some of the useful plants including Carya spp and Crocus sativus.

[183] Facciola. S. Cornucopia - A Source Book of Edible Plants. Kampong Publications 1990 ISBN 0-9628087-0-9
Excellent. Contains a very wide range of conventional and unconventional food plants (including tropical) and where they can be obtained (mainly N. American nurseries but also research institutes and a lot of other nurseries from around the world.

[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.

[229] Elias. T. The Complete Trees of N. America. Field Guide and Natural History. Van Nostrand Reinhold Co. 1980 ISBN 0442238622
A very good concise guide. Gives habitats, good descriptions, maps showing distribution and a few of the uses. It also includes the many shrubs that occasionally reach tree proportions.

Readers Comments

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Plant information taken from the Plants For A Future - Species Database. Copyright (c) 1997-2003.
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