One such massive, noxious weed may be growing in your yard, waiting to burn you if you try to remove it too quickly. Heracleum mantegazzianum, better known as giant hogweed, has been present in the ...

Many harmful weeds, such as poison ivy and poison oak, contain urushiol, causing rashes and blisters. Weeds like giant hogweed and wild parsnip produce sap that can lead to severe skin burns upon ...