California blackberry (Rubus ursinus) is well-known as a delicious and abundant fruit. The Indians ate it straight off the vine and sometimes dried it for the winter.
But did you know an infusion of its roots are effective at stopping diarrhea? The Little Lake Indians of Mendocino County were known to use its roots in this manner. Diarrhea can quickly kill one via dehydration, so in any survival situation, this would be a great herbal medicine to remember!
The spines of the young leaves are soft, and these young leaves are edible, although they have a quite astringent taste. They’re best brewed into a mild tea.
The fibers of the stems make pretty good cordage. When you soak them in water and lightly pound them to separate the longitudinal fibers, the spines will come off.
Another use for the fruits is as a dye.
Himalayan blackberry (Rubus armeniacus) is a common invasive species in California. It’s distinguished by R. ursinus by having larger, thicker spines that are more distantly spaced on the stems.