Giant hogweed (Heracleum mantegazzianum) also known as giant cow parsley, hogsbane, or cartwheel-flower, is a plant in the carrot family. People who touch its sap may develop giant hogweed burns ...

Weeds such as wild carrot, cow parsley and celery grow at least 350 ... The world's largest weed is the giant hogweed, from Central Asia. It reaches 3.65m (12ft) in height and has leaves 91cm ...