Mahonia nervosa aka Cascade Barberry

Mahonia nervosa, also known as dwarf Oregon-grape, Cascade barberry, Cascade Oregon-grape, or dull Oregon-grape, is a compact, suckering, evergreen shrub native to the northwest coast of North America. It can be found from southern British Columbia to central California, with a separate population in northern Idaho. This flowering plant is commonly found in second growth forests of Douglas-fir or western redcedar, taking advantage of pockets of sunlight that reach the forest floor. Some consider the entire genus Mahonia to be part of the Berberis genus. Lewis and Clark collected this plant during their expedition and it was later described by Frederick T. Pursh in 1813. This rare houseplant grows up to 60cm tall and features dark green, spiny-edged leaflets that may turn red in winter. In late spring and early summer, it produces clusters of yellow flowers that are 15-20cm long. These flowers are followed by blue-black fruits. Cascade Barberry thrives with regular watering and prefers abundant sunlight, ideally positioned less than 3 feet from a window. It requires well-draining soil and typically does not need additional fertilizers if repotted each time it doubles in size.