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Fabaceae FAMILY

Caragana boisii

Caragana boisii

Edibility
3/5
Medicinal
2/5

Safety & Hazards

The following report belongs to the closely related C. arborescens. Reports that this plant contains toxins have not been substantiated[1]. The occurrence of cystine in the seeds is doubtful[1].

Cultivation Details

HabitDeciduous Shrub
GrowthFast

Caragana boisii is a very cold-tolerant species - dormant plants are hardy to about -30°c[2]. However, it prefers a continental climate with hot summers to ripen its wood, and does not grow so well in areas with mild, especially wet winters - in such a situation the plant can be stimulated into growth too early in the spring, this young growth being susceptible to frost damage[3]. Succeeds in most well-drained soils, preferring a position in full sun and a light sandy dry or well-drained soil[4, 5, 3]. Tolerates very alkaline soils[6]. Plants do not require a rich soil[4, 5, 7], succeeding on marginal land[8]. Established plants are drought resistant[8]. A fast growing plant[9]. Plants take 3 - 5 years to reach commercial bearing size, good crops are then usually prroduced every year[10]. This species is closely related to Caragana arborescens, differing in the longer teeth of the calyx and in the downy ovary and young fruit[5]. It can probably be used in all the ways Caragana arborescens is used and therefore has an excellent potential for human food.[PFAF]. A good bee plant[11]. Plants in this genus are notably resistant to honey fungus[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].

Propagation

Seed - best sown as soon as it is ripe in a cold frame[3]. It usually germinates in 2 weeks[PFAF]. Stored seed should be pre-soaked for 24 hours in warm water then sown in a cold frame[12, 13, 3]. If the seed has not swollen then scarify it and re-soak for another 12 hours before sowing[14]. Germination usually takes place within 2 - 3 weeks at 20°c[14]. Good percentage[5]. As soon as they are large enough to handle, prick the seedlings out into individual pots and grow them on in a greenhouse for at least their first winter. Plant them out into their permanent positions in late spring or early summer, after the last expected frosts. Cuttings of half-ripe wood, 7 - 10cm with a heel, mid summer in a frame[13]. Layering in spring. Cite as: Temperate Plants Database, Ken Fern. temperate.theferns.info. 2026-02-20. <temperate.theferns.info/plant/Caragana+boisii>

Pollinators

Bees

References

  1. [1]A Colour Atlas of Poisonous Plants. — Frohne. D. and Pfänder. J. · 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.
  2. [2]Shrubs. — Phillips. R. & Rix. M. · Pan Books · 1989 · ISBN 0-330-30258-2 ↩︎Excellent photographs and a terse description of 1,900 species and cultivars.
  3. [3]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.
  4. [4]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 ]).
  5. [5]Trees and Shrubs Hardy in Great Britain. Vol 1 - 4 and Supplement. — Bean. W. · Murray · 1981 · ISBN - ↩︎A classic with a wealth of information on the plants, but poor on pictures.
  6. [6]Climbers and Wall Shrubs. — Davis. B. · Viking. · 1990 · ISBN 0-670-82929-3 ↩︎Contains information on 2,000 species and cultivars, giving details of cultivation requirements. The text is terse but informative.
  7. [7]Garden Plants Valuable to Bees. — International Bee Research Association. · International Bee Research Association. · 1981 · ISBN - ↩︎The title says it all.
  8. [8]Wonder Crops. 1987. — Natural Food Institute, ↩︎Fascinating reading, this is an annual publication. Some reports do seem somewhat exaggerated though.
  9. [9]The RHS Gardener's Encyclopedia of Plants and Flowers — Brickell. C. · Dorling Kindersley Publishers Ltd. · 1990 · ISBN 0-86318-386-7 ↩︎Excellent range of photographs, some cultivation details but very little information on plant uses.
  10. [10]Handbook of Energy Crops — Duke. J. · - · 1983 · https://hort.purdue.edu/newcrop/duke_energy/dukeindex.html · ISBN - ↩︎Published only on the Internet, excellent information on a wide range of both temperate and tropical plants.
  11. [11]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.
  12. [12]Propagation of Trees, Shrubs and Conifers. — Sheat. W. G. · MacMillan and Co · 1948 · ISBN - ↩︎A bit dated but a good book on propagation techniques with specific details for a wide range of plants.
  13. [13]The Reference Manual of Woody Plant Propagation. — Dirr. M. A. and Heuser. M. W. · Athens Ga. Varsity Press · 1987 · ISBN 0942375009 ↩︎A very detailed book on propagating trees. Not for the casual reader.
  14. [14]Growing from Seed. Volume 3. — Bird. R. (Editor) · Thompson and Morgan. · 1989 · ISBN - ↩︎Very readable magazine with lots of information on propagation.
  15. [15]Flora of China — Missouri Botanical Garden Press; St. Louis. · 1994 · http://flora.huh.harvard.edu/china/ ↩︎An excellent, comprehensive resource in 25 volumes. In addition to the botanical information the flora also gives basic information on habitat and some uses. An on-line version is also available.
  16. [16]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.
  17. [17]Tanaka's Cyclopedia of Edible Plants of the World. — Tanaka. T. & Nakao S. · Keigaku Publishing; Tokyo · 1976 · ISBN - ↩︎The most comprehensive list of edible plants I've come across. Only the briefest entry for each species, though, and some of the entries are more than a little dubious. Not for the casual reader.
  18. [18]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.
  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]A Dictionary of Plants Used by Man. — Usher. G. · Constable · 1974 · ISBN 0094579202 ↩︎Forget the sexist title, this is one of the best books on the subject. Lists a very extensive range of useful plants from around the world with very brief details of the uses. Not for the casual reader.
  21. [21]Plants for Human Consumption. — Kunkel. G. · 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.
  22. [PFAF]Plants for a Future — pfaf.org ↩︎