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 ...

(l) The Swallowtail's favourite cow parsley, and (r) the distinctive markings of the Swallowtail caterpillar The team also keeps a close eye on the salt levels in the fen water and manages this by ...

Weeds such as wild carrot, cow parsley and celery grow at least 350 seeds on a single flower-head. Wild clematis grows climbing, sprawling stems up to 30m long (100ft) - that's about 20 people ...