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Lablab purpureus
Fabaceae FAMILY

Lablab purpureus

Lablab purpureus

Edibility
4/5
Medicinal
2/5

Safety & Hazards

The raw seed is poisonous[1]. Mature seeds have a high content of toxic cyanogenic glucosides and trypsine, and must be thoroughly cooked before eating[2]. Cooking completely destroys the toxin[3].

Cultivation Details

HabitPerennial Climber
Growth—

Hyacinth bean can be grown in a wide range of environmental conditions - various strains have been developed that are adapted to different environemnts[2]. It grows well in lowland tropical and subtropical areas, but can also succeed when grown up to an elevation of around 2,000 metres[4]. In the Temperate zone it grows best when treated as an annual in areas with long hot summers in order to bring the crop to maturity. It grows best in areas where annual daytime temperatures are within the range 18 - 32°c, but can tolerate 3 - 38°c[3]. The plant can only tolerate occasional light frosts. It prefers a mean annual rainfall in the range 600 - 1,000mm, but tolerates 200 - 2,500mm[3]. Requires a sunny position[3]. Easily grown in an ordinary garden soil so long as the temperature is sufficient[5]. Succeeds in relatively poor soils so long as they are well-drained[6]. Prefers a rich moist soil in a warm sheltered position[7]. Prefers a well-drained soil with a high organic matter content and a pH between 5.5 and 6[8]. Prefers a pH in the range 5 - 7.5, tolerating 4.5 - 8[3]. Some varieties are drought resistant[8]. Plants are fairly fast-growing[8] Immature pods are ready to harvest from 70 - 120 days after sowing[8]. Mature pods ripen after 140 - 210 days[3]. Yields of the dried seed are around 2,200kg per hectare in favourable conditions[4]. Optimum yield of green pods is 7.5 tonnes/ha and the average yield in India is 2.6 - 4.5 tonnes/ha[3]. There are many named varieties[9, 8, 10] varying in height from 60cm to 2 metres. Short-day, long-day and daylength-neutral varieties are available, day-length-neutral or long-day varieties should be used in temperate climates[8, 10]. 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[8].

Propagation

Seed - pre-soak for 2 hours in warm water and sow in early spring in a greenhouse in a fairly rich soil[11, 7]. Either sow 2 seeds to a pot and thin to the strongest plant, or sow in a tray and prick out into individual pots when the plants are large enough to handle. Grow on fast and plant out after the last expected frosts. The seed germinates in 2 - 4 weeks at 25°c. Cite as: Temperate Plants Database, Ken Fern. temperate.theferns.info. 2026-02-21. <temperate.theferns.info/plant/Lablab+purpureus>

Pollinators

Insects

References

  1. [1]The Oxford Book of Food Plants. — Harrison. S. Wallis. M. Masefield. G. · Oxford University Press · 1975 · ISBN - ↩︎Good drawings of some of the more common food plants from around the world. Not much information though.
  2. [2]Protabase - Plant Resources of Tropical Africa. — http://www.prota.org ↩︎An excellent on-line database with detailed information on over 3,200 species of useful plants of Africa.
  3. [3]Ecocrop — http://ecocrop.fao.org/ecocrop/srv/en/home ↩︎Basic information on a wide range of useful plants, plus details of environmental needs where available.
  4. [4]Vegetables in the Tropics — Tindall. H. D. · MacMillan, Oxford. · 1983 · ISBN 0-333-24268-8 ↩︎An excellent, in-depth look at the main vegetable crops that can be grown in the Tropics, plus many less well-known plants.
  5. [5]RHS Dictionary of Plants plus Supplement. 1956 — F. Chittendon. · Oxford University Press · 1951 · ISBN - ↩︎Comprehensive listing of species and how to grow them. Somewhat outdated, it has been replaced in 1992 by a new dictionary (see [ 200 ]).
  6. [6]Oriental Vegetables — Larkcom J. · John Murray · 1991 · ISBN 0-7195-4781-4 ↩︎Well written and very informative.
  7. [7]Focus on Plants. Volume 5. (formerly 'Growing from seed') — Bird. R. (Editor) · Thompson and Morgan. · 1991 · ISBN - ↩︎Very readable magazine with lots of information on propagation. A good article on Corydalis spp.
  8. [8]The New RHS Dictionary of Gardening. 1992. — Huxley. A. · 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.
  9. [9]Cornucopia - A Source Book of Edible Plants. — Facciola. S. · 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.
  10. [10]Cornucopia II — Facciola. S. · Kampong Publications, California. · 1998 · ISBN 0-9628087-2-5 ↩︎The second edition of an excellent guide to the edible uses of plants, though it does not give any details of cultivation etc.
  11. [11]Rare Vegetables for Garden and Table. — Organ. J. · Faber · 1960 · ISBN - ↩︎Unusual vegetables that can be grown outdoors in Britain. A good guide.
  12. [12]Plant Resources of Southeast Asia — http://proseanet.org/ ↩︎Lots of information on the uses of the plants of SE Asia.
  13. [13]Sturtevant's Edible Plants of the World. — Hedrick. U. P. · Dover Publications · 1972 · ISBN 0-486-20459-6 ↩︎Lots of entries, quite a lot of information in most entries and references.
  14. [14]The Vegetable Garden. — Vilmorin. A. · Ten Speed Press · ISBN 0-89815-041-8 ↩︎A reprint of a nineteenth century classic, giving details of vegetable varieties. Not really that informative though.
  15. [15]Flora of the USSR. — Komarov. V. L. · Israel Program for Scientific Translation · 1968 · http://www.biodiversitylibrary.org · ISBN - ↩︎An immense (25 or more large volumes) and not yet completed translation of the Russian flora. Full of information on plant uses and habitats but heavy going for casual readers. It can be downloaded from the Internet.
  16. [16]Economic Botany. — Hill. A. F. · The Maple Press · 1952 · ISBN - ↩︎Not very comprehensive, but it is quite readable and goes into some detail about the plants it does cover.
  17. [17]Famine Foods listed in the Chiu-Huang Pen-ts'ao. — Reid. B. E. · Southern Materials Centre; Taipei · 1977 · ISBN - ↩︎A translation of an ancient Chinese book on edible wild foods. Fascinating.
  18. [18]Medicinal Plants of China — Duke. J. A. and Ayensu. E. S. · Reference Publications, Inc. · 1985 · ISBN 0-917256-20-4 ↩︎Details of over 1,200 medicinal plants of China and brief details of their uses. Often includes an analysis, or at least a list of constituents. Heavy going if you are not into the subject.
  19. [19]Dictionary of Economic Plants. — Uphof. J. C. Th. · Weinheim · 1959 · ISBN - ↩︎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.
  20. [20]The Plant Wealth of Iraq. — Chakravarty. H. L. ↩︎It is surprising how many of these plants can be grown in Britain. A very readable book on the useful plants of Iraq.
  21. [21]Wonder Crops. 1987. — Natural Food Institute, ↩︎Fascinating reading, this is an annual publication. Some reports do seem somewhat exaggerated though.
  22. [22]A Barefoot Doctors Manual. — ? · Running Press; Philadelphica. · 1977 · ISBN 0-914294-92-X ↩︎A very readable herbal from China, combining some modern methods with traditional chinese methods.
  23. [23]Handbook of Chinese Herbs and Formulas. — Yeung. Him-Che. · Institute of Chinese Medicine, Los Angeles · 1985 · ISBN - ↩︎An excellent Chinese herbal giving information on over 500 species. Rather technical and probably best suited to the more accomplished user of herbs.
  24. [24]Chinese Materia Medica. — Stuart. Rev. G. A. · Taipei. Southern Materials Centre · 1911 · ISBN - ↩︎A translation of an ancient Chinese herbal. Fascinating.
  25. [25]Glossary of Indian Medicinal Plants (Including the Supplement). — Chopra. R. N., Nayar. S. L. and Chopra. I. C. · Council of Scientific and Industrial Research, New Delhi. · 1986 · ISBN - ↩︎Very terse details of medicinal uses of plants with a wide range of references and details of research into the plants chemistry. Not for the casual reader.
  26. [26]Plants and People of Nepal — Manandhar. N. P. · Timber Press. Oregon. · 2002 · ISBN 0-88192-527-6 ↩︎Excellent book, covering over 1,500 species of useful plants from Nepal together with information on the geography and peoples of Nepal. Good descriptions of the plants with terse notes on their uses.
  27. [27]Medicinal Plants in Vietnam — Nguyen Van Dan & Doan Thi Nhu · World Health Organisation · 1989 · ISBN 92 9061 101 4 ↩︎An excellent book, giving information on over 200 plants, their medicinal compounds and applications.