Shrub · Rosaceae
California blackberry
Rubus ursinus
California blackberry is recorded as native to 4 states and territories in Kew’s World Checklist of Vascular Plants and USDA PLANTS, and recorded in 92 counties of those states by USDA PLANTS.
Key facts · USDA PLANTS
California blackberry at a glance
- Native in
- 92 counties, across 4 states and territories
- Estimated cold hardiness
- Zone 8a PLANTS minimum temperature 7°F
- Mature height
- 2 ft PLANTS mature height
- Light and water
- Full sun (shade-intolerant) Medium water use
Estimated cold hardiness: zone 8a. PLANTS gives a minimum temperature of 7°F; zone 8a winters bottom out at 10°F, the coldest half-zone that stays within that limit.
California blackberry is recorded as native to 4 states and territories in Kew’s World Checklist of Vascular Plants and USDA PLANTS, and recorded in 92 counties of those states by USDA PLANTS.
Counties where it is native
The 15 counties with the most ZIP codes among the 92 where it is listed.
Native counties by state
- California 41 counties
- Idaho 5 counties
- Oregon 24 counties
- Washington 22 counties
Growing traits
Values from the PLANTS characteristics record. “Not recorded” means PLANTS has no value; nothing here is estimated except the zone.
Growth
- Growth habit
- Subshrub
- Duration
- Perennial
- Mature height
- 2 ft
- Growth rate
- Rapid
- Growth form
- Thicket Forming
- Shape
- Semi-Erect
- Lifespan
- Short
- Active growth period
- Spring and Summer
Light and water
- Shade tolerance
- Intolerant (full sun (shade-intolerant))
- Moisture use
- Medium water use
- Drought tolerance
- Medium
- Tolerance of waterlogged soil
- None
- Precipitation range
- 14 to 24 in per year
Soil
- Soil textures
- Coarse, medium and fine
- pH range
- 6 to 7.5
- Lime (CaCO₃) tolerance
- Medium
- Salinity tolerance
- None
- Fertility requirement
- Medium
- Minimum root depth
- 14 in
Climate
- Minimum temperature
- 7°F
- Estimated cold hardiness
- Zone 8a and warmer
- Minimum frost-free days
- 190
- Fire tolerance
- High
Flowers, leaves and fruit
- Flower color
- White
- Showy flowers
- Yes
- Bloom period
- Early Spring
- Foliage color
- Green
- Showy in fall
- No
- Keeps leaves
- No
- Fruit color
- Black
Other
- Toxicity
- None
- Nitrogen fixation
- None
- Nursery availability
- Contracting Only
- Family
- Rosaceae
- PLANTS symbol
- RUUR
Source & data date
- Source
- USDA NRCS PLANTS Database: county distribution records, native status and plant characteristics. CC0 (public domain dedication, per the data.gov catalog record).
- Kew’s World Checklist of Vascular Plants (WCVP): native or introduced status by state. CC BY 3.0.
- USGS US-RIIS (ver. 2.0): species listed as introduced are excluded. CC0.
- Citation
- USDA, NRCS. 2026. The PLANTS Database (https://plants.usda.gov, 11/04/2026). National Plant Data Team, Greensboro, NC USA.
- Govaerts R. (ed.) (2026). WCVP: World Checklist of Vascular Plants. Facilitated by the Royal Botanic Gardens, Kew. Data file dated 2026-06-04, http://sftp.kew.org/pub/data-repositories/WCVP/ (retrieved 2026-11-04). Paper: Govaerts R. et al. (2021) The World Checklist of Vascular Plants, a continuously updated resource for exploring global plant diversity. Scientific Data 8, 215.
- Data date
- Retrieved from PLANTS on November 4, 2026; WCVP data file dated June 4, 2026.
- Scope
- Rubus ursinus (PLANTS symbol RUUR).
- Method
- A species is listed when it is recorded as native to the state in Kew’s World Checklist of Vascular Plants and USDA PLANTS, and recorded in the county by USDA PLANTS. Species PLANTS labels both native and introduced are listed separately. Full method · All sources