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Yucca harrimaniae

Common name:	Spanish Bayonet	Family:	Agavaceae
Author:	Trelease.	Botanical references:	11, 200, 228
Synonyms:
Known Hazards:	The roots contain saponins[222]. Whilst saponins are quite toxic to people, they are poorly absorbed by the body and so tend to pass straight through. They are also destroyed by prolonged heat, such as slow baking in an oven. Saponins are found in many common foods such as beans[K]. Saponins are much more toxic to some creatures, such as fish, and hunting tribes have traditionally put large quantities of them in streams, lakes etc in order to stupefy or kill the fish[K].
Range:	Central N. America - Utah to Colorado.
Habitat:	High plains grasslands to open coniferous woods[228].
Edibility Rating (1-5):	2	Medicinal Rating (1-5):	0

Other Common Names:	From various places around the Web, may not be correct. See below.
	Spanish Bayonet [P], Spanish-bayonet [B],
Systematics:	From a USDA Plants Database
	Order: Liliales. Century-plant family

Physical Characteristics

An evergreen shrub growing to 0.4m at a slow rate. It is hardy to zone 7. It is in leaf all year. The flowers are hermaphrodite (have both male and female organs) and are pollinated by Hand. We rate it 2/5 for edibility and 0/5 for medicinal use.

The plant prefers light (sandy), medium (loamy) and heavy (clay) soils, requires well-drained soil and can grow in nutritionally poor soil. The plant prefers acid, neutral and basic (alkaline) soils. It can grow in semi-shade (light woodland) or no shade. It requires dry or moist soil and can tolerate drought. The plant can tolerates strong winds but not maritime exposure.

Habitats and Possible Locations

Cultivated Beds.

Edible Uses

Flowers; Fruit; Stem.

Fruit - the immature fruit is cooked. A bitter taste, but most of the bitterness is in the skin[85].
Flowers - raw or cooked[85]. They are delicious raw, and can also be dried, crushed and used as a flavouring[164].
Flowering stem - peeled, cooked and used like asparagus[164]. The whitish inner portion is eaten[85].

Medicinal Uses

Disclaimer

None known

Other Uses

Broom; Fibre; Soap.

A fibre obtained from the leaves is used for making ropes, baskets and mats[82, 85, 169]. The leaves themselves can be used as paint brushes[92], brooms or woven to make mats etc[85].
The roots are rich in saponins and can be used as a soap substitute[85].

Cultivation details

Thrives in any soil but prefers a sandy loam and full exposure to the south[11]. Requires a sunny position[11]. Plants are hardier when grown on poor sandy soils[200]. Established plants are very drought resistant, this species is also tolerant of cool damp weather[11].
Hardy to at least -30°c[164].
Closely allied to Y. glauca[1].
In the plants native environment, its flowers can only be pollinated by a certain species of moth. This moth cannot live in Britain and, if fruit and seed is required, hand pollination is necessary. This can be quite easily and successfully done using something like a small paint brush.
Individual crowns are monocarpic, dying after flowering[233]. However, the crown will usually produce a number of sideshoots before it dies and these will grow on to flower in later years[233].
Plants in this genus are notably resistant to honey fungus[200].
Members of this genus seem to be immune to the predations of rabbits[233]

Propagation

Seed - sow spring in a greenhouse. Pre-soaking the seed for 24 hours in warm water may reduce the germination time. It usually germinates within 1 - 12 months if kept at a temperature of 20°c. Prick out the seedlings into individual pots when they are large enough to handle and grow them on in the greenhouse or cold frame for at least their first two winters. Plant them out into their permanent positions in early summer and consider giving them some winter protection for at least their first winter outdoors - a simple pane of glass is usually sufficient[K]. Seed is not produced in Britain unless the flowers are hand pollinated.
Root cuttings in late winter or early spring. Lift in April/May and remove small buds from base of stem and rhizomes. Dip in dry wood ashes to stop any bleeding and plant in a sandy soil in pots in a greenhouse until established[78].
Division of suckers in late spring[111]. Larger divisions can be planted out direct into their permanent positions. We have found that it is best to pot up smaller divisions and grow them on in light shade in a greenhouse or cold frame until they are growing away well. Plant them out in the following spring.

Suppliers

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

PFAF Web Pages

This plant is mentioned in the following web pages

Web References

[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.
[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.

[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]).

[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.

[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.

[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.

[85] Harrington. H. D. Edible Native Plants of the Rocky Mountains. University of New Mexico Press 1967 ISBN 0-8623-0343-9
A superb book. Very readable, it gives the results of the authors experiments with native edible plants.

[92] Balls. E. K. Early Uses of Californian Plants. University of California Press 1975 ISBN 0-520-00072-2
A nice readable book.

[111] Sanders. T. W. Popular Hardy Perennials. Collingridge 1926
A fairly wide range of perennial plants that can be grown in Britain and how to grow them.

[164] Bird. R. (Editor) Growing from Seed. Volume 4. Thompson and Morgan. 1990
Very readable magazine with lots of information on propagation. A good article on Yuccas, one on Sagebrush (Artemesia spp) and another on Chaerophyllum bulbosum.

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

[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.

[222] Foster. S. & Duke. J. A. A Field Guide to Medicinal Plants. Eastern and Central N. America. Houghton Mifflin Co. 1990 ISBN 0395467225
A concise book dealing with almost 500 species. A line drawing of each plant is included plus colour photographs of about 100 species. Very good as a field guide, it only gives brief details about the plants medicinal properties.

[228] McGregor. R. L. & Barkley. T. M. Flora of the Great Plains. University Press of Kansas. 1986 ISBN 070060295x
A useful source of habitats.

[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.

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Bibliography

Plant information taken from the Plants For A Future - Species Database. Copyright (c) 1997-2003.
WEB search engine by Rich Morris - Home Page- Contact Info
Blagdon Cross, Ashwater, Beaworthy, Devon, EX21 5DF, UK.
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