Robuta

https://www.rhs.org.uk/plants/374035/andropogon-gerardii-red-arrow/details Andropogon gerardii 'Red Arrow' | big blue stem 'Red Arrow' Herbaceous Perennial/RHS big blue stem andropogon gerardii red arrow herbaceous perennial rhs https://www.fws.gov/species/andropogon-gerardii-andropogon-gerardii/map Andropogon gerardii | Map | U.S. Fish & Wildlife Service | FWS.gov u s fish wildlife service andropogon gerardii map fws