knotweed japanese, invasive expansive species of dangerous plants leaf, leaves asia reynoutria fallopia japonica

animals asia background biodiversity biomass blue botany bushes calamity contamination czech dangerous disaster ecology eliminates environmental europe european expansive fallopia flower fruits gatecrasher green herbicides intruder invasive japan japanese japonica knotweed large leaf leaves mechanically nature neophyte perennial plants projects reduces reynoutria sachalinensis sakhalin shadow sky soil species wild wildflower