polygonum sachalinense in spring. green young plant in spring

autumn background beautiful biology bloom blossom branch britain crenate edible exotic fallopia floral flower foliage garden giant green grow growth gynodioecious heartshaped herbaceous invasive japanese japonica knotweed leaf margin nature perennial pest plant reynoutria sachalinense sachalinensis sakhalin season seasonal shoot species spring sprout stalk stem tree weed wild