Practical
Plants

Lupinus polyphyllus

Big-Leaf Lupin

a perennial member of the Lupinus genus in the family Leguminosae.

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Taxonomy and growth

Genus
Lupinus
Life cycle
perennial
Height
1.5 m
Fertility
Bees
Flower type
hermaphrodite
Pollinators
Bees

Uses

Toxicity

Toxicity warning. The historical record reports a hazard for this plant. Do not use it to decide which parts are safe to eat or use medicinally.

This section contains historical Plants For A Future notes marked noncommercial.

The seed of many lupin species contain bitter-tasting toxic alkaloids, though there are often sweet varieties within that species that are completely wholesome[7][8]. 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[7].

Edible uses

Root - raw or cooked[9].1 There are no edible uses listed for Lupinus polyphyllus.

Medicinal uses

Historical medicinal uses. These records describe reported uses. They do not establish safety or effectiveness. Ask a qualified health professional before using any plant medicinally.

This section contains historical Plants For A Future notes marked noncommercial.

A decoction of the plant has been used as a tonic[4].

Environment

Range
Western N. America - British Columbia to California. A garden escape in Britain[2].
Habitat
Usually found in wetlands from sea level to 3000 metres[5].
Light
full sun
Shade tolerance
no shade
Water
moderate
Hardiness
Zone 3+
Soil textures
sandy, loamy, clay
Soil pH
very acid, acid, neutral
Drainage
well drained
Tolerances
high wind, drought
Wind
Yes
Tolerates Nutritionally Poor Soil
No
Drought
tolerant

Propagation

This section contains historical Plants For A Future notes marked noncommercial.

Pre-soak the seed for 24 hours in warm water and then sow in early spring in a greenhouse[1][3]. Germination should take place within a couple of weeks. When they are large enough to handle, prick the seedlings out into individual pots and plant them out in the summer. It should also be possible to sow the seed in situ in mid spring. It might be necessary to protect the sowing from mice. Division in March. Difficult. Basal cuttings, April in a cold frame. Harvest the shoots when they are about 10cm long with plenty of underground stem. Pot them up into individual pots and keep them in light shade in a cold frame or greenhouse until they are rooting well. Plant them out in the summer.

Cultivation

This section contains historical Plants For A Future notes marked noncommercial.

An easily grown plant, succeeding in any moderately good soil in a sunny position[1][3]. It strongly dislikes excessive winter wet[1]. Requires an acid to neutral soil[3]. Succeeds in poor soils[6]. Plants can be naturalized in the wild garden, especially on stream banks and for flowering above rough grass, where they may be short-lived but will self-seed[3]. Plants dislike root disturbance. There are some named varieties, selected for their ornamental value[3]. 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[3].

References

  1. F. Chittendon. RHS Dictionary of Plants plus Supplement. 1956 Oxford University Press 1951-00-00

    ↩1↩2↩3

  2. Clapham, Tootin and Warburg. Flora of the British Isles. Cambridge University Press 1962-00-00

    ↩

  3. Huxley. A. The New RHS Dictionary of Gardening. 1992. MacMillan Press 1992-00-00 ISBN 0-333-47494-5

    ↩1↩2↩3↩4↩5↩6

  4. Moerman. D. Native American Ethnobotany Timber Press. Oregon. 1998-00-00 ISBN 0-88192-453-9

    ↩

  5. Flora of California www.calflora.org

    ↩

  6. Hitchcock. C. L. Vascular Plants of the Pacific Northwest. University of Washington Press 1955-00-00

    ↩

  7. Frohne. D. and Pf�nder. J. A Colour Atlas of Poisonous Plants. Wolfe 1984-00-00 ISBN 0723408394

    ↩1↩2

  8. Cooper. M. and Johnson. A. Poisonous Plants in Britain and their Effects on Animals and Man. HMSO 1984-00-00 ISBN 0112425291

    ↩

  9. Moerman. D. Native American Ethnobotany Timber Press. Oregon. ISBN 0-88192-453-9 (1998-00-00)

    ↩

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