polygonum cuspidatum

alien asia asian autumn biology botanical botany characteristic colonizer cruise cuspidatum day edible environment exotic fall fallopia flora garden gardening grow growing growth herbaceous holiday horitoru invasive itadori japan japanese japonica journey knotweed lake large leaves nature oriental outdoor oval perennial pest plant polygonum problem resveratrol robust seeds shape sightseeing sour species spread tourism tourist touristic travel trip truncated vacation vegetable weed weeding wild