A very large perennial herb occurring in derelict gardens, neglected urban places and waste ground, on rubbish tips, roadsides and by streams and rivers, forming large colonies if allowed to prosper. It spreads by seed, which is prolifically produced. Lowland.
H. mantegazzianum was introduced to gardens as a monumental curiosity by 1820. It was deliberately planted by rivers and ponds and was first recorded in the wild in 1828 (Cambs.). Its spread has been rapid since the 1962 Atlas, despite the fact that the plant has been the subject of control measures now that its capacity to cause dermatitis has become known.
Native of S.W. Asia.
PLANTATT - Attributes of British and Irish plants. (.zip 1455KB) This dataset was compiled and published in 2004, and last updated in November 2008. Download includes an Excel spreadsheet of the attributes, and a PDF explaining the background and nomenclature. Note that the PDF version is the booklet as published, whereas the Excel spreadsheet incorporates subsequent corrections. A hardcopy can be purchased from the Centre for Ecology and Hydrology.
Atlas text references
1996. Biological Flora of the British Isles. No. 190. Heracleum mantegazzianum Sommier & Levier. Journal of Ecology. 84:297-319.
1980. Umbellifers of the British Isles. Botanical Society of the British Isles Handbook no. 2.