A large perennial herb naturalised in grassy places and on roadsides and pathways, where it originates as a garden escape. Lowland.
T. macrophyllum was first grown in Britain in 1803, and was known in the wild by 1908. It may be increasing in the Scottish lowlands.
Native of S.E. Europe and 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.