Ernie Janes / Giant Hogweed (Heraculum mantegazziamum) growing near the sea, with woman walking dog in distance, Norfolk, England, July 2013.

Colin Varndell / Female Common yellow dung fly (Scathophaga stercoraria) resting on a Giant hogweed (Hercaleum mantegazziaum) flower, Dorset, England, UK, June

Ernie Janes / Giant hogweed (Heraculum mantegazzianum) flowering in countryside, Norfolk, UK

Duncan Mcewan / Giant hogweed {Heracleum mantegazzianum} Scotland, UK

Martin Gabriel / Giant hogweed {Heracleum mantegazzianum} pest species, introduced, Germany

Niall Benvie / Giant hogweed {Hercaleum mantegazzianum} Angus, Scotland, UK

Philippe Clement / Giant hogweed / Giant cow parsley (Heracleum mantegazzianum) in flower at forest's edge, Belgium. June.

Philippe Clement / Giant hogweed / Giant cow parsley (Heracleum mantegazzianum) in flower at forest's edge, Belgium. June.

Nigel Cattlin / Umbels of flowers of poisonous Giant hogweed (Heracleum mantegazzianum) plant against blue sky, Devon, England, UK, June.

Colin Varndell / Giant hogweed (Heracleum mantegazzianum) in bloom, Dorset, UK, June.

Nigel Cattlin / Giant ichneumon wasp (Gasteruption jaculator) female visiting hogweed (Heracleum sphondylium) flowers, Berkshire, UK, July.

Nigel Cattlin / Umbels of flowers of poisonous and notifiable plant giant hogweed (Heracleum mantegazzianum) against blue sky, Devon, England, UK, June.