blossom wasp vespula germanica giant hogweed heracleum mantegazzianum flower bloom cartwheel-flower, western honey bee

wasp giant invasive hogweed plant heracleum mantegazzianum bloom bee flowers blossom expansive leaf cartwheel parsnip hogsbane flower vespula germanica species dangerous plants leaves caucasus eurasia fruits intruder cow parsley achenes saw neophyte asia blooming reduces wild rhubarb green wildflower collect phototoxic biodiversity gatecrasher contamination herbicides mechanically bushes calamity disaster biomass