A tall and very conspicuous annual of well-drained, open and disturbed ground, such as waste land, railway-sides and docks, chiefly around towns. It also occurs as a wool casual. Lowland.
The first record for C. sumatrensis in our area was from Guernsey in 1961. It was found naturalised in S. Essex in 1974 and was well established in the London area by 1984. It appears to be spreading rapidly, and was first recorded in Ireland in 1990.
Native of S. America; widely naturalised in Europe.
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.