Pacific Blackberry is a species in the Rosaceae (Rose) family that is native to a large part of western North America from Baja to Canada and from the coast to the Rocky Mountains. This is a wide, spreading shrub or vine-bearing bush with prickly branches, white flowers and edible fruits. This species is one of the original parents of the hybrids Loganberry and Boysenberry. Pacific Blackberry typically does not set fruit until the second year after planting, and it is typically dioeocious so that only the female plants produce fruit. The sweet-tart fruits are dark purple to black and up to 2 centimeters in length. They can be eaten raw, baked in pie or cobbler, or frozen. Seed size seems to be related to fruit "cell" size, and the smallest (1 centimeter) fully formed berries are most highly prized. The plant is a vigorous spreader that needs cool temperatures and high amounts of moisture to set large fruit. For this reason fruit production and flavor is generally inferior in the southernmost part of it range. Growing Pacific Blackberry requires some thought and care because its numerous prickles can make harvesting the fruits, weeding, pruning and other maintenance activities unpleasant.