Frangula californica (syn. Rhamnus californica) is an evergreen to semi-evergreen California native shrub grown for drought-tolerant landscaping and wildlife habitat. Its berries progress from green through red to deep purple-black as they ripen, resembling coffee beans—the source of its common name. Thrushes, waxwings, and other fruit-eating birds feed heavily on the ripe fruit.
Coffeeberry grows naturally in coastal scrub, chaparral, and oak woodland edges. It performs across a wide range of soil textures, including clay and loam, but requires adequate drainage to prevent root disease. Container-grown plants establish most reliably when set out in fall to coincide with winter rains. Established shrubs are highly drought tolerant and rarely need intervention. Left unpruned, they make effective informal screens and slope-stabilizing plantings; selective pruning maintains a compact form. A layer of organic mulch over the root zone helps moderate soil temperature and retain moisture through the first two summers.
Native peoples throughout California and the Pacific Northwest used the dried bark as a purgative in the same manner as closely related cascara (Frangula purshiana). The bark contains anthraquinone glycosides, the compound class responsible for the documented laxative action of both species.
Phytophthora Root Rot
Wilting despite moist soil, yellowing leaves, stunted growth, and dark, decayed roots and crown tissue. Vines may collapse during hot weather.
Plant in well-draining soil and avoid waterlogging. Remove and destroy affected vines. Improve drainage with raised beds or amended soil and avoid overwatering.
Sudden Oak Death
Reddish-brown to black bleeding cankers on the lower trunk ooze dark sap; inner bark beneath the canker is stained deep red-brown. Foliage may wilt and die rapidly as the canker girdles the stem. Leaf lesions occur on some hosts but are secondary on oaks.
No systemic cure is available once infection is established. Preventive trunk injections with potassium phosphite applied before infection can slow canker progression in high-risk areas. Remove and chip or burn infected wood on-site; do not transport infected material off the property. Report confirmed or suspected cases to the California Department of Food and Agriculture.
Armillaria Root Rot
Thinning, yellowing canopy with progressive dieback; white, fan-shaped mycelial mats visible beneath bark at or just below the soil line; honey-colored mushroom clusters appearing at the trunk base or on surface roots in autumn.
No chemical cure exists. Improve drainage and avoid any injury to roots or trunk. Remove severely infected trees along with as much root material as possible. Do not replant susceptible species in the same spot.