heracleum sosnowskyi known as giant hogweed is dangerous

cow parsley european union fennel giant hogweed ground elder heracleum sosnowskyi sosnowsky 039 alien botanical botany burns cause chemical close dangerous floral flower flowers foliage humans garden gardening green horticultural horticulture hot liquids injury invasive leaf leaves liquid natural nature outdoor outdoors acid photosensitivity plant juice plants radiation scarring skin small drops species summer tall toxic ultraviolet white