This is Panicum virgatum Cave in Rock. This is the larval host plant for the Northern Pearly-eye, Tawny-edge Skipper, Delaware Skipper, Teleus Longtail, Dakota Skipper, Dotted Skipper, Northern Broken-Dash, Indian Skipper, Hobomok Skipper, and Least Skipper butterflies. USDA Hardiness Zones 2 to 9.