jerusalem artichoke topinambur plant helianthus tuberosus blossom yellow sunroot sunchoke earth apple, sunchoke wild

jerusalem artichoke topinambur plant helianthus tuberosus blossom yellow sunroot sunchoke earth apple wild sunflower flowers invasive expansive species closeup bloom detail flower dangerous plants leaf river water tuber shrub bushes leaves fruits nord america canada intruder neophyte reduces biodiversity eliminates disaster calamity gatecrasher biomass achenes bush growth green europe