Japanese "bamboo" (knotwood) "Japanese Knotweed, Reynoutria japonica var. japonica" Japanese Knotweed "Japanese Knotweed, Reynoutria japonica var. japonica" Invading Species Awareness Programme Japanese Knotweed Japanese Knotweed, Reynoutria japonica var. japonica Japanese Knotweed Japanese Knotweed Japanese Knotweed Japanese Knotweed Ontario’s Invading Species organization Ontario’s Invading Species organization