Rubus ursinus

Rubus ursinus, Pacific blackberry, is a  native blackberry that ranges from Baja to British Columbia and into Idaho. In southern California this blackberry doesn't always set fruit. It appears like it does only when conditions are right. When? Probably in cool, moist, years. The plants harbor beneficial insects and commonly grow with Artemisia douglasiana, Salix species, Cornus species, cottonwoods, Hedge nettle,  and other riparian species.

This blackberry is a larval food source for Western Tiger Swallowtail Butterfly, Papilio rutulus, Mourning Cloak Butterfly, Nymphalis antiopa, Gray hairstreak, Strymon melinus, and Spring Azure Butterfly, Celastrina ladon.

Grows in the filtered shade to full shade of a creek bank. In coastal areas it will grow from full shade to full sun, in the interior it will hide more in the shade.

Easy to grow as long as you have water and space, (give plenty of water in the desert).  Berries are good. This is the parent of Loganberry, Youngberry, and Boysenberry. 

Most effective in stabilizing a creek bank or the edges of a bioswale or banks of a flood basin.