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Allium unifolium

Allium unifolium: Flowers
Photo by Ken Fern. High resolution version

Common name:	One-Leaved Onion	Family:	Alliaceae
Author:	Kellogg.	Botanical references:	60, 200
Synonyms:	Allium grandisceptrum (Davidson.)
Known Hazards:	Although no individual reports regarding this species have been seen, there have been cases of poisoning caused by the consumption, in very large quantities and by some mammals, of certain members of this genus. Dogs seem to be particularly susceptible[76].
Range:	South-western N. America.
Habitat:	Moist soils in pine or mixed evergreen forest in the coastal ranges of California[60, 90].
Edibility Rating (1-5):	3	Medicinal Rating (1-5):	2

Other Common Names:	From various places around the Web, may not be correct. See below.
	One-leaf Onion [B], Oneleaf Onion [P],
Epithets:	From a Dictionary of Botanical Epithets
	unifolium = one leaved

Physical Characteristics

Bulb growing to 0.6m by 0.1m . It is hardy to zone 8 and is not frost tender. It is in flower from June to July. The flowers are hermaphrodite (have both male and female organs) and are pollinated by Bees and insects. We rate it 3/5 for edibility and 2/5 for medicinal use.

The plant prefers light (sandy) and medium (loamy) soils and requires well-drained soil. The plant prefers acid, neutral and basic (alkaline) soils. It cannot grow in the shade. It requires dry or moist soil.

Habitats and Possible Locations

Cultivated Beds.

Edible Uses

Flowers Leaves Root.

Bulb - raw or cooked[161, 177, 257]. The bulbs are 10 - 15mm in diameter[200]. Together with the young shoots, they are fried and eaten[183].
Leaves - raw or cooked[183].
Flowers - raw. Used as a garnish on salads.

Medicinal Uses

Disclaimer

Although no specific mention of medicinal uses has been seen for this species, members of this genus are in general very healthy additions to the diet. They contain sulphur compounds (which give them their onion flavour) and when added to the diet on a regular basis they help reduce blood cholesterol levels, act as a tonic to the digestive system and also tonify the circulatory system[K].

Other Uses

Repellent.

The juice of the plant is used as a moth repellent. The whole plant is said to repel insects and moles[20].

Cultivation details

Prefers a hot dry sunny position in a light, rich well-drained soil[90, 200]. This species is difficult to maintain under cultivation in Britain, our weather is probably too wet and cool for it to really thrive[142]. The plant has a summer resting period when it should be kept dry and so it is best grown in a cold greenhouse or bulb frame[203]. Placing a cloche over outdoor-grown plants in the summer, especially after flowering, will help to ripen the bulbs[142]. Most members of this genus are intolerant of competition from other growing plants[203].
This species is not fully hardy in Britain and is unlikely to survive in the colder parts of the country. It is only marginally hardy in N.W. England[203].
A new bulb is formed annually, the old one withering away[90].
Grows well with most plants, especially roses, carrots, beet and chamomile, but it inhibits the growth of legumes[18, 20, 54]. This plant is a bad companion for alfalfa, each species negatively affecting the other[201].
Members of this genus are rarely if ever troubled by browsing deer[233].

Propagation

Seed - sow spring in a cold frame. Prick out the seedlings into individual pots when they are large enough to handle - if you want to produce clumps more quickly then put three plants in each pot. Grow them on in the greenhouse for at least their first winter and plant them out into their permanent positions in spring once they are growing vigorously and are large enough.
Division in spring. The plants divide successfully at any time in the growing season, pot up the divisions in a cold frame or greenhouse until they are growing well and then plant them out into their permanent positions.

Suppliers

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

Web References

[H] Details of Scandanavian and European Common names in Henriette's names database
[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.
Images from the CalPhoto database.
[G] Data (Common Names, Uses, Distribution) from the USDA/ARS NPGS's GRIN taxonomic database.
[P] Data. (uses, distribution, wetland) from the USDA'a Plants database.
[HP] Links, Photos, Suppliers from Hortiplex Plant Database

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.

[18] Philbrick H. and Gregg R. B. Companion Plants. Watkins 1979
Details of beneficial and antagonistic relationships between neighbouring plants.

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

[54] Hatfield. A. W. How to Enjoy your Weeds. Frederick Muller Ltd 1977 ISBN 0-584-10141-4
Interesting reading.

[60] Hitchcock. C. L. Vascular Plants of the Pacific Northwest. University of Washington Press 1955
A standard flora for Western N. America with lots of information on habitat etc. Five large volumes, it is not for the casual reader.

[76] Cooper. M. and Johnson. A. Poisonous Plants in Britain and their Effects on Animals and Man. HMSO 1984 ISBN 0112425291
Concentrates mainly on the effects of poisonous plants to livestock.

[90] Phillips. R. and Rix. M. Bulbs Pan Books 1989 ISBN 0-330-30253-1
Superbly illustrated, it gives brief details on cultivation and native habitat.

[142] Brouk. B. Plants Consumed by Man. Academic Press 1975 ISBN 0-12-136450-x
Readable but not very comprehensive.

[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.

[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.

[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.

[201] Allardice.P. A - Z of Companion Planting. Cassell Publishers Ltd. 1993 ISBN 0-304-34324-2
A well produced and very readable book.

[203] Davies. D. Alliums. The Ornamental Onions. Batsford 1992 ISBN 0-7134-7030-5
Covers about 200 species of Alliums. A very short section on their uses, good details of their cultivation needs.

[233] Thomas. G. S. Perennial Garden Plants J. M. Dent & Sons, London. 1990 ISBN 0 460 86048 8
A concise guide to a wide range of perennials. Lots of cultivation guides, very little on plant uses.

[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.

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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