This perennial often grows in emergent masses in small, sheltered, eutrophic water bodies, especially ponds and ditches but also reservoirs, canals and flooded mineral workings. Only female plants are known in Britain and they spread clonally by vegetative fragmentation. Lowland.
This species, which has been grown in water gardens in Britain since 1878, was first recorded in the wild in 1960 in Surrey and in 1969 in E. Sussex; in Ireland it was first seen in Co. Down in 1990. It is introduced when surplus garden plants are dumped in the wild and the extent to which it spreads naturally to new sites is unknown.
Native of central S. America; female plants are now widely naturalised in warm temperate and tropical areas elsewhere.
Perennation - primary
Life Form - primary
Clonality - primary
Count of 10km squares in Great Britain: 268
Count of 10km squares in Ireland: 2
Count of 10km squares in the Channel Isles: 7
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.