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Blossom yellow Jerusalem artichoke plant Helianthus tuberosus topinambur sunroot sunchoke or earth apple, sunchoke wild sunflower flowers invasive and expansive species bloom flower of dangerous plants tuber leaf in river water stream creek shrub bushes, leaves and fruits, comes from Nord America Canada intruder neophyte, reduces the biodiversity of other plants botany and animals, eliminates herbicides, contamination disaster calamity flowers gatecrasher biomass Europe