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Rubus ursinus Cham. & Schlecht.
California blackberry, California dewberry, Western blackberry
USDA Symbol: RUUR
USDA Native Status: Native to U.S.
A mounding shrub or vine with bristly, running stems; large, trifoliate leaves; and clusters of white flowers near the tips of lateral shoots. The flowers differ from those of other blackberries because of their widely spaced, narrow petals. Flowers are followed by edible, black berries. Ranges from 2-5 ft. high and more than 6 ft. wide.
The Trailing Blackberry is a member of the family Rosaceae which includes about 2000 species of trees, shrubs, and herbs worldwide; approximately 77 native and 9 naturalized tree species and many species of shrubs and herbs in North America; including service-berries (Amelanchier), hawthorns (Crataegus), apples (Malus), plums and cherries (Prunus), and mountain-ashes (Sorbus).
Bloom InformationBloom Color: White , Pink
Bloom Time: Mar , Apr , May , Jun , Jul
CA , ID , MT , OR , WA Canada: BC Native Distribution:
B.C. & ID to Sanders Co., MT, s. to Baja through cismontane CA Native Habitat:
Variable; below 3000 ft. USDA Native Status: L48(N), CAN(N)
Growing ConditionsWater Use: Medium
Light Requirement: Sun , Part Shade , Shade
Soil Moisture: Moist , Wet
CaCO3 Tolerance: Medium
Soil Description: Moist soils.
Conditions Comments: Fast and easy to grow. Good for revegetation. Too rank for most residential sites.
BenefitUse Wildlife: Very high for songbirds, game birds, and large and small mammals.
Conspicuous Flowers: yes
PropagationDescription: Divisions, tip layering, and digging up suckers are the most common methods of propagation. Increase by seed is tricky but possible.
Seed Collection: Rubus fruits should be collected as soon as ripe to prevent losses to birds. The seeds can be extracted by macerating in water.
Seed Treatment: The hard, impermeable seed coat needs scarification. Both H2SO4 and sodium hypochlorite have been used. Scarification is sometimes followed by a complex combination of warm and cold stratification.
Commercially Avail: yes
From the National Organizations Directory
According to the species list provided by Affiliate Organizations, this plant is either on display or available from the following:
Native Seed Network
- Corvallis, OR
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Record Modified: 2007-01-01
Research By: TWC Staff