Apios americana: 7-8’ high x 1’ wide / full sun to part shade / zone 3
The First Nations of North America have been cultivating the ground nut for centuries. The annual vines need something to climb each spring, while the perennial tubers are dug any time of year for use as a starchy, nutty root vegetable. It is a good companion plant for jerusalem artichoke; it can twine around the stalks, and the tubers of both can be dug at the same time. Ground nuts are also nitrogen-fixers, and will slowly spread to form a colony if they have the space. They’re currently being bred for commercial production by Louisiana State University.