Rubus ulmifolius aka Elmleaf Blackberry

Rubus ulmifolius, also known as elmleaf blackberry or thornless blackberry, is a species of wild blackberry native to Western Europe and North Africa. It has become naturalized in parts of the United States (especially California), Australia, and southern South America. The plant is a semi-deciduous, prickly shrub with straight to curved thorns on the angles of the long canes, pink flowers, and red to black berry fruit. It is a member of the Rubus L. genus and Rosaceae family. Elmleaf blackberry is also known as Himalaya blackberry, Himalayan giant blackberry, zarza, zarzamora, Elm-Leaved Bramble, Bramble, and Burbank's thornless blackberry. Elmleaf blackberry is an invasive species that colonizes natural and semi-natural ecosystems, competing with and displacing native plant species and negatively impacting native fauna. It is a problem in parts of Argentina, Chile, Australia, New Zealand, and the United States. In addition to being a wild plant, elmleaf blackberry is also a rare houseplant that requires regular watering to thrive. It prefers long-lasting, direct light and well-draining soil. Repotting each time it doubles in size should provide sufficient nutrients for the plant, without the need for added fertilizers.