heracleum mantegazzianum or giant hogweed

agriculture bloom blossom bud cartwheelflower caucasus cow field florescence flower forest giant giganteum grass harvest heracleum herb herbal herbs hercules hogsbane hogweed insects leaf main mantegazzianum many meadow names ornamental parsley parsnip pasture perennial perennials photo phototoxic plans plant poison poisonous summer toxic umbel weed wild