WSU Clark County Extension

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Trailing Pacific Blackberry

Scientific name: Rubus ursinus

Plant Requirements
Zone:3 to 9
Plant Characteristics
Height:1 ft
Width:10 ft
Bloom:Spring flowers
Bloom Time:May to June
Bloom Color:White
Additional Characteristics



Wildlife value

Description Trailing pacific blackberry, also called California blackberry, or Pacific dewberry, is an invasive vine that grows throughout the Northwest from the Cascades to the Pacific Ocean.

This species is classified as an evergreen, low growing vine, with trailing stems that can extend outwards up to 10 or more feet in length. Its slender stems bear alternate, compound leaflets (3 to 5 leaves). Leaves are ovate, lobed and doubly serrated, 1.5” to 3” in length, and dark green above and paler below. The stems are covered with thorns, which are easily detached.

In the spring flowers form on second year canes (floricanes). Flower petals are narrow in width, white to pink in color, and are 1”-2” across. During the summer flowers give rise to black, sweet, one-half inch long edible fruit.

Widely adapted to both sun and shade conditions on all soil types. This plant is considered an invasive as it can grow wildly into cultivated gardens and farms. A thicket of spiny vines makes for unpleasant travel and general garden activities.

None reported.
For assistance, contact Dr. Charles Brun (, (360) 397-6060 5701
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