knotweed japanese, invasive blossom yellow jerusalem artichoke helianthus tuberosus flowers plants leaf river shrub

achenes apple artichoke asia big biomass bloom blossom bush bushes calamity contamination creek disaster earth eliminates europe expansive fallopia flower flowers gatecrasher green growth helianthus herbicides intruder invasive japan japanese japonica jerusalem knotweed large leaf leaves lush neophyte plants reduces reynoutria river sachalinensis shrub sunchoke sunroot tuberosuswater wild wildflower yellow