Dahlia imperialis

The Tree Dahlia is the tallest member of the Dahlia genus and is native to high elevations in Mexico and Central America. Because of its upland habitat, this species is surprisingly cold hardy and flourishes in many temperate climates. Rapidly reaching heights of up to 20 feet in one season, you can literally watch the canes grow throughout the day. The Tree Dahlia has tubers and will die down during the winter making over-wintering similar to other Dahlias.

Cold hardy to zones 7b and above.