This East Asian grass has increased rapidly across southeastern states during recent decades. It is generally considered an annual but culms are "often decumbent... rooting at lower nodes" (FNA 25). In Ky. the first colls. were made in about 1980 (Woods 1983; M). It is now widely scattered and locally abundant on seasonally damp medium-acid soils in open disturbed areas. Dispersal may often occur on tires of vehicles; JC has observed several patches in parking lots and dirt-road beds of the central Bluegrass region (CLAR, HARR, MERC). However, the species does not seem to be increasing much within this region, perhaps due to the heavy calcareous soils and competition from other species.