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Lupinus mutabilis - Sweet.

Pearl Lupin

Author	Sweet.	Botanical references	200
Family	Leguminosae	Genus	Lupinus
Synonyms
Known Hazards	The seed of many lupin species contain bitter-tasting toxic alkaloids, though there are often sweet varieties within that species that are completely wholesome[65, 76]. Taste is a very clear indicator. These toxic alkaloids can be leeched out of the seed by soaking it overnight and discarding the soak water. It may also be necessary to change the water once during cooking. Fungal toxins also readily invade the crushed seed and can cause chronic illness[65].
Range	S. America - Colombia.
Habitat	Found in the Andes[177].
Edibility Rating	5 (1-5)	Medicinal Rating	0 (1-5)

Physical Characteristics

Annual growing to 1.5m by 0.25m.

The plant prefers light (sandy), medium (loamy) and heavy (clay) soils and can grow in nutritionally poor soil. The plant prefers acid and neutral soils. It cannot grow in the shade. It requires moist soil and can tolerate drought. The plant can tolerates strong winds but not maritime exposure.

Habitats

Cultivated Beds;

Edible Uses

Edible Parts: Seed.

Edible Uses: Oil.

Seed - cooked[141]. Used as a protein-rich vegetable or savoury dish in any of the ways that cooked beans are used. The seed can also be ground into a meal and then used with cereal flours in making bread etc[196]. The seed contains up to 50% protein that is rich in lysine and cystine but very low in methionine[183, 196]. If the seed is bitter this is due to the presence of toxic alkaloids, these alkaloids can usually be removed by soaking the seed overnight and discarding the water[200]. Another report suggests that the seed needs to be soaked for 2 - 3 days in order to leech out the alkaloids[183]. An edible oil is obtained from the seed[141, 183]. It is relatively rich in unsaturated fatty acids, including the nutritionally essential linoleic acid[196].

Medicinal Uses

Plants For A Future can not take any responsibility for any adverse effects from the use of plants. Always seek advice from a professional before using a plant medicinally.

None known

Other Uses

Green manure; Oil.

Seed yields up to 18% of an edible oil with uses similar to Soya oil (Glycine soya)[141, 177]. Soya oil has a very wide range of applications and is commonly used in the chemical industry[171, 206]. It is also used in making soap, plastics, paints etc[34, 46, 100]. An excellent green manure crop, it is able to fix as much as 400kg of atmospheric nitrogen per hectare[196].

Cultivation details

An easily grown plant, succeeding in any moderately good soil in a sunny position[200]. Requires an acid to neutral soil[200]. This species might be intolerant of lime[1]. Succeeds on poor soils, its taproot breaking up the sub-soil[196]. Once established, it is a very drought tolerant plant[196]. Mature plants tolerate frost[196]. This has not been our experience, although they tolerate light frosts, the plants are killed by heavy or prolonged frosts[K]. The pearl lupin is cultivated in Tropical and Sub-tropical zones for its edible seed, there are many named varieties. The seed of most forms contains bitter alkaloids that need to be leached out before the seed can be eaten, however there are some forms that have sweet alkaloid-free seeds[141]. This species has excellent potential as a food crop in temperate zones. It is day-length neutral, flowering and fruiting well at most latitudes[196]. The plants flower and ripen seed continuously until killed by cold weather, making mechanical harvesting difficult[196]. Plants take from 5 - 11 months to fully ripen their crop[196]. The genes for low-alkaloid types are recessive so they have to be grown separated from other forms if the strains are to be kept pure[196]. It is also probable that plants will hybridize with other species in this genus[196]. This species has a symbiotic relationship with certain soil bacteria, these bacteria form nodules on the roots and fix atmospheric nitrogen. Some of this nitrogen is utilized by the growing plant but some can also be used by other plants growing nearby[200]. When removing plant remains at the end of the growing season, it is best to only remove the aerial parts of the plant, leaving the roots in the ground to decay and release their nitrogen.

Propagation

Pre-soak the seed for 24 hours in warm water and sow in mid spring in situ[1, 200]. You may need to protect the seed from mice. Germination should take place within 2 weeks. The seed can also be sown in situ as late as early summer as a green manure crop.

Cultivars

No entries have been made for this species as yet.

Links

This plant is also mentioned in the following PFAF articles: Alternative Food Crops, Staple seed crops from perennials..

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]).

[34] Harrison. S. Wallis. M. Masefield. G. The Oxford Book of Food Plants. Oxford University Press 1975
Good drawings of some of the more common food plants from around the world. Not much information though.

[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.

[65] Frohne. D. and Pfänder. J. A Colour Atlas of Poisonous Plants. Wolfe 1984 ISBN 0723408394
Brilliant. Goes into technical details but in a very readable way. The best work on the subject that I've come across so far.

[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.

[100] Polunin. O. Flowers of Europe - A Field Guide. Oxford University Press 1969 ISBN 0192176218
An excellent and well illustrated pocket guide for those with very large pockets. Also gives some details on plant uses.

[141] Carruthers. S. P. (Editor) Alternative Enterprises for Agriculture in the UK. Centre for Agricultural Strategy, Univ. of Reading 1986 ISBN 0704909820
Some suggested alternative commercial crops for Britain. Readable. Produced by a University study group.

[171] Hill. A. F. Economic Botany. The Maple Press 1952
Not very comprehensive, but it is quite readable and goes into some a bit of detail about the plants it does cover.

[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.

[196] Popenoe. H. et al Lost Crops of the Incas National Academy Press 1990 ISBN 0-309-04264-X
An excellent book. Very readable, with lots of information and good pictures of some lesser known food plants of S. America.

[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.

[206] Larkcom J. Oriental Vegetables John Murray 1991 ISBN 0-7195-4781-4
Well written and very informative.

Readers Comments

Plants for a Future does not verify the accuracy of reader comments, use at your own risk. In particular Plants For A Future can not take any responsibility for any adverse effects from the use of plants. You should always consult a professional before using plants medicinally.

Lupinus mutabilis

Brian Cady Tue Feb 22 05:20:18 2005

Link: From the Andes; First Potato,Then Quinoa, Now Tarwi? Article printed in _The Natural Farmer_, Fall, 2004

Lupinus mutabilis

Brian Cady Mon Mar 28 21:12:31 2005

Link: Lost Crops of the Andes: Tarwi Chapter

Lupinus mutabilis

Brian Cady Mon Mar 28 21:18:49 2005

Book title misremebered: should be _Lost Crops of the Incas_

Lupinus mutabilis

Boguslav Mon Jul 31 2006

Lupins Geography, classification, genetic resources and breeding

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