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Rhamnaceae FAMILY

Frangula californica

Frangula californica

Edibility
2/5
Medicinal
2/5

Safety & Hazards

Species in this genus contain hydroxyanthracene derivatives which have a stimulant laxative effect upon the body, and many species are used traditionally as laxatives. In small doses, and for short periods, these can be safe and effective, but used over long periods they can weaken the body's natural ability to defecate and can have a range of long-lasting negative effects upon the body, including anaemia, malabsorption, haematuria and weight loss. Large single doses can cause severe purging.

Cultivation Details

HabitEvergreen Shrub
Growth—

Frangula californica is a moderately cold-hardy plant, able to tolerate short periods with temperatures down to around -15°c when fully dormant. It grows best in areas with hot summers. In areas with cooler summers (even if the winters are mild), such as the maritime regions of the temperate zone, it often grows poorly, failing to properly ripen its wood and suffering frost damage over the winter[1, 2]. Grows well in full sun, succeeding also in light shade and doing well in the understorey of light woodland[3]. Tolerant of a range of soils from sands to clays[3]. Established plants are drought tolerant[3]. Tolerant of occasional inundation of the soil[3]. Plants usually commence flowering when around 3 - 5 years old from seed[3]. Lifespan is believed to be in the region 100 - 200 years[4]. Plants respond well to pruning and can be coppiced[3]. Frangula californica is a very variable species, the Flora of N. America recognizes six subspecies that are more or less separated geographically, though intermediate forms do exist[5]. The plant is reported to be a secondary host for the rust disease of velvet grass (Puccinia spp. or Holcus spp.)[3].

Propagation

Seed - best sown in the autumn in a cold frame. Stored seed will require 1 - 2 months cold stratification at about 5° and should be sown as early in the year as possible in a cold frame or outdoor seedbed[2]. Germination is usually good, at least 80% by late spring. 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 their first winter. Plant them out in late spring or early summer of the following year. Cuttings of half-ripe wood, mid summer in a frame[6]. Cuttings of mature wood of the current year's growth, autumn in a frame. Layering in early spring[7]. Cite as: Temperate Plants Database, Ken Fern. temperate.theferns.info. 2026-02-21. <temperate.theferns.info/plant/Frangula+californica>

Pollinators

Insects

References

  1. [1]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.
  2. [2]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.
  3. [3]Plants Database — United States Department of Agriculture · http://plants.usda.gov/java/factSheet ↩︎An online database with an excellent collection of fact sheets about native N. American plants.
  4. [4]Fire Effects Information System — http://www.feis-crs.org/feis/ ↩︎An on-line information site with comprehensive information on over 1,100 species of plant. Mainly developed to supply information on the effects of fire on plants and animals, it also contains a wealth of other information on the plants
  5. [5]Flora of N. America — http://flora.huh.harvard.edu/fna/ ↩︎An on-line version of the flora with an excellent description of the plant including a brief mention of plant uses.
  6. [6]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.
  7. [7]A Modern Herbal. — Grieve. · Penguin · 1984 · ISBN 0-14-046-440-9 ↩︎Not so modern (1930's?) but lots of information, mainly temperate plants.
  8. [8]An Illustrated Dictionary of Medicine, Biology and Allied Sciences. — Gould G.M. · P. Blakiston's Son & Co.; Philadelphia. · 1907 · http://www.biodiversitylibrary.org ↩︎A major work at the time, though very dated now. Contains quite a lot of information about medicinal plant uses.