General Impact
This perennial bunchgrass sometimes forms continuous cover in boggy, open mesic and dry habitats. It releases highly persistent allelopathic substances (Rice 1972, In Smith). The dead material provides an excellent fuel for fires. It is fire-stimulated; its cover increases dramatically with each fire (Smith, Parman, and Wampler, 1980, in Smith). In areas where it occurs, both fire intensities and acreage burnt have increased, (Smith). Work in Oklahoma in the US showed no change with a single spring burn, an increase with two spring burns, and that it was drastically reduced with a summer or fall burn when soil conditions were dry. Andropogon virginicus invades forest and other native vegetation, along tracks, (ESC, undated). Nearly pure stands can persist as a result of competition and allelopathy, (Uchytil, 1992).
Location Specific Impacts:Hawaii (Hawai‘i) Is. (United States (USA)) 
Modification of fire regime: Dried material contributes to fire hazard, and reproduction is encouraged by fire. Kaua`i Is. (United States (USA))
Modification of fire regime: Dried material contributes to fire hazard, and reproduction is encouraged by fire. Kaua`i Is. (United States (USA))
Modification of fire regime: The dead material provides an excellent fuel for fires. It is fire-stimulated; its cover increases dramatically with each fire (Smith, Parman, and Wampler 1980). In areas where it occurs, both fire intensities and acreage burnt have increased.
Other: It is dormant during the rainy season, which Mueller-Dombois (1973) has shown leads to increased erosion in some areas. Lana`i (Lanai) Is. (United States (USA))
Modification of fire regime: Dried material contributes to fire hazard, and reproduction is encouraged by fire. Moloka`i (Molokai) Is. (United States (USA))
Modification of fire regime: Dried material contributes to fire hazard, and reproduction is encouraged by fire. West Maui (United States (USA))
Modification of fire regime: Dried material contributes to fire hazard, and reproduction is encouraged by fire. East Moloka'i (United States (USA))
Modification of fire regime: The dead material provides an excellent fuel for fires. It is fire-stimulated; its cover increases dramatically with each fire (Smith, Parman, and Wampler 1980). In areas where it occurs, both fire intensities and acreage burnt have increased.
Other: It is dormant during the rainy season, which Mueller-Dombois (1973) has shown leads to increased erosion in some areas. Pupukea (United States (USA))
Modification of fire regime: The dead material provides an excellent fuel for fires. It is fire-stimulated; its cover increases dramatically with each fire (Smith, Parman, and Wampler 1980). In areas where it occurs, both fire intensities and acreage burnt have increased.
Other: It is dormant during the rainy season, which Mueller-Dombois (1973) has shown leads to increased erosion in some areas. Windward plain (United States (USA))
Modification of fire regime: The dead material provides an excellent fuel for fires. It is fire-stimulated; its cover increases dramatically with each fire (Smith, Parman, and Wampler 1980). In areas where it occurs, both fire intensities and acreage burnt have increased.
Other: It is dormant during the rainy season, which Mueller-Dombois (1973) has shown leads to increased erosion in some areas. Hawaii (United States (USA))
Modification of fire regime: The dead material provides an excellent fuel for fires. It is fire-stimulated; its cover increases dramatically with each fire (Smith, Parman, and Wampler 1980). In areas where it occurs, both fire intensities and acreage burnt have increased.
Other: It is dormant during the rainy season, which Mueller-Dombois (1973) has shown leads to increased erosion in some areas.
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