Prunus nigra, the Canada plum, Canadian plum, or black plum, is a species of Prunus, native to eastern North America from Nova Scotia west to Minnesota and southeastern Manitoba, and south as far as Connecticut, Illinois, and Iowa. It formerly also grew in Ohio but is now thought to be extinct in that state. Isolated populations are present along streambanks in Saskatchewan and Alberta, along Lake Timiskaming in northern Ontario, and along the Maine-New Brunswick border, though this latter population is now severely threatened as the tree is a host for an aphid that menaces the local potato crop and so many of the trees have been cut down.