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Washingtonia filifera

Common name: Desert Fan Palm Family: Palmae
Author: (Linden. ex André .)H.Wendl. Botanical references: 71
Synonyms:  
Known Hazards: None known
Range: South-western N. America - S. California, S.W. Arizona, N.W. Mexico.
Habitat: Often forming extensive groves or small isolated clumps in moist alkaline spots in rocky canyons about seeps, springs and streams below 1500 metres[71, 82, 166].
Edibility Rating (1-5): 1Medicinal Rating (1-5):0

Other Possible Synonyms:From various places across the web, may not be correct. See below.
Brahea filamentosa[B,G,P] Brahea filifera[B] Brahea filifera hort. ex[P] Neowashingtonia filamentosa[B,G,P] Neowashingtonia filifera[G] Pritchardia filamentosa[B,G,P] Pritchardia filifera[B,G,P] W. filamentosa[B,G,P] W. filifera var. robusta[B,P]
Other Common Names:From various places around the Web, may not be correct. See below.
California Fan Palm [H,B,P,DEN2], California Palm [FEIS],
Epithets:From a Dictionary of Botanical Epithets
filifer = bearing threads filifera = bearing threads
Systematics:From a USDA Plants Database
Order: Arecales. Renamed to Arecaceae -- Palm family

Physical Characteristics

An evergreen tree growing to 12m by 12m at a medium rate. It is hardy to zone 9. It is in leaf all year, in flower from July to August, and the seeds ripen from November to January. The flowers are hermaphrodite (have both male and female organs). We rate it 1/5 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 and can grow in very alkaline and saline soils. It cannot grow in the shade. It requires dry or moist soil and can tolerate drought.

Habitats and Possible Locations

Woodland, Sunny Edge, Dappled Shade, By Walls, By South Wall, By West Wall.

Edible Uses

Fruit Leaves Seed.

Fruit - raw or cooked or dried for later use[2, 46, 161, 177, 257]. It can be made into jellies and drinks or dried and ground into a meal[46, 183]. The seed can be ground up with the dried fruit and then both are eaten as a porridge[246]. The fruit is small and hard[213], but has a thin sweet pulp that tastes somewhat like dates[183, 213]. The ovoid fruit is about 6mm long and 4mm wide[200].
Young central bud - roasted[46, 177, 183]. Harvesting this central bud will kill the tree since it is unable to make side branches[K].
Young leaf bases - raw or cooked[161, 177].
Seed - cooked. It can be ground into a powder and used for making bread or porridge[161, 183].

Medicinal Uses

Disclaimer

None known

Other Uses

Fibre Musical Weaving.

A fibre from the leaves is used in basket making and for cordage[46, 169].
The whole leaves are woven and used as the side walls and roofs of huts and temporary dwellings[46, 257].
The seeds have been used as the rattle in gourd rattles[257].
Wood - light and soft[82]. It has been used for making cooking implements, spoons etc[257].

Cultivation details

Requires a sheltered sunny position in a fertile moist but well-drained soil[188, 231]. Tolerates some salt in the soil[200] and maritime exposure in climates that are warmer than Britain[200]. Plants can tolerate extensive droughts so long as their roots have tapped into underground water supplies[231].
Plants can tolerate light frosts and should succeed outdoors in the mildest parts of Britain[166]. They have been known to tolerate short-lived lows down to about -10° c[231].
This species has an extensive and fleshy but strong root system that can penetrate to a considerable depth in search of water[231]. It generally establishes best when planted out at a young stage. However, older plants are substantially more cold tolerant than juvenile plants[231]. In areas at the limit of their cold tolerance, therefore, it is prudent to grow the plants in containers for some years, giving them winter protection, and only planting them into their permanent positions when sheer size dictates[231]. Palms can also be transplanted even when very large. Although the thick fleshy roots are easily damaged and/or desiccated, new roots are generally freely produced. It is important to stake the plant very firmly to prevent rock, and also to give it plenty of water until re-established - removing many of the leaves can also help[231].
Plants growing in the wild are seen as an indication of underground water[200].
Plants produce a 'skirt' of old dead leaves, this can be a fire hazard and the old leaves are usually removed when being grown in areas liable to forest fires[200].
A fast growing tree, even when young, in its native environment and very tolerant of transplanting despite its deep root system[200].

Propagation

Seed - best sown as soon as it is ripe in a greenhouse. Pre-soaking for 24 hours in warm water may speed up germination, especially of stored seed[200]. When they are large enough to handle, prick the seedlings out into individual pots and grow them on in the greenhouse for at least their first two winters. Plant them out into their permanent positions in late spring or early summer, after the last expected frosts. Give the plants some protection from the cold for at least their first two winters outdoors.

Suppliers

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

Web References

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.

[2] Hedrick. U. P. Sturtevant's Edible Plants of the World. Dover Publications 1972 ISBN 0-486-20459-6
Lots of entries, quite a lot of information in most entries and references.

[46] Uphof. J. C. Th. Dictionary of Economic Plants. Weinheim 1959
An excellent and very comprehensive guide but it only gives very short descriptions of the uses without any details of how to utilize the plants. Not for the casual reader.

[71] Munz. A California Flora. University of California Press 1959
An excellent flora but no pictures. Not for the casual reader.

[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.

[161] Yanovsky. E. Food Plants of the N. American Indians. Publication no. 237. U.S. Depf of Agriculture.
A comprehensive but very terse guide. Not for the casual reader.

[166] Taylor. J. The Milder Garden. Dent 1990
A good book on plants that you didn't know could be grown outdoors in Britain.

[169] Buchanan. R. A Weavers Garden.
Covers all aspects of growing your own clothes, from fibre plants to dyes.

[177] Kunkel. G. Plants for Human Consumption. Koeltz Scientific Books 1984 ISBN 3874292169
An excellent book for the dedicated. A comprehensive listing of latin names with a brief list of edible parts.

[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.

[188] Brickell. C. The RHS Gardener's Encyclopedia of Plants and Flowers Dorling Kindersley Publishers Ltd. 1990 ISBN 0-86318-386-7
Excellent range of photographs, some cultivation details but very little information on plant uses.

[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.

[213] Weiner. M. A. Earth Medicine, Earth Food. Ballantine Books 1980 ISBN 0-449-90589-6
A nice book to read though it is difficult to look up individual plants since the book is divided into separate sections dealing with the different medicinal uses plus a section on edible plants. Common names are used instead of botanical.

[231] McMillan-Browse. P. Palms for Cooler Climates. Trebah Enterprises. 1993 ISBN 0 9521952 0 8
An excellent little booklet on the subject, though it does not mention many plant uses.

[246] Radio 4 AM - 1997
A news item on the Radio 4 morning news programme 'AM', 15/10/97.

[257] Moerman. D. Native American Ethnobotany Timber Press. Oregon. 1998 ISBN 0-88192-453-9
Very comprehensive but terse guide to the native uses of plants. Excellent bibliography, fully referenced to each plant, giving a pathway to further information. Not for the casual reader.


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