A tall, rhizomatous perennial herb naturalised in waste places, by railways, on roadside verges, river banks and rubbish tips on a wide range of soil types. Most plants in the wild originate from the dumping of garden rubbish and probably spread further by seed. Lowland.
S. gigantea was cultivated in Britain by 1758, and it is now commonly grown in gardens. It was known from the wild by 1916 but, like S. canadensis, it did not become widespread until after 1930. It is likely to be spreading.
Native of N. 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.