Many hybrid clones between Populus species have been planted in the Northern Great Plains. Most hybrids grow very fast but often lack the cold and drought hardiness of the native cottonwood. The most common parent species of these hybrids are Cottonwood (Populus deltoides) and Black Poplar (Populus nigra). These hybrids are referred to as the P. x euramericana hybrids. Other species that have been crossed with Cottonwood include Balsam Poplar, Japanese Poplar and Russian Poplar.