Corn stover is the stalk, leaves, husks and tassels left in the field after harvesting grain with a combine harvester. It can be used to make advanced biofuels or as a low quality, emergency livestock feed.

Panicum virgatum, commonly known as switchgrass, is one of the dominant species of the central North American tallgrass and is used primarily for soil conservation, forage production, game cover, as an ornamental grass, in phytoremediation projects, fiber, electricity, heat production, for biosequestration of atmospheric carbon dioxide, and more recently as a biomass crop for ethanol and butanol.