Most species of wild blackberry, also called brambles, provide important sources of food and cover for many birds and mammals. Four species, however, are considered weeds. Two of these are non-natives, cutleaf blackberry (Rubus laciniatus) and Himalaya blackberry (Rubus discolor [=R. procerus]). In addition, two native species can also be weeds under certain conditions, thimbleberry (Rubus parviflorus) and California blackberry (Rubus ursinus [=R. vitifolius]). Of these weedy species, the most common, vigorous, and troublesome is Himalaya blackberry.
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