An annual or perennial herb which is well-naturalised in the Channel Islands on roadsides and by pools. In England it grows on tips and damp waste ground, and is spreading as a weed of nurseries, gardens and pavement cracks. Lowland.
P. viridis was introduced into cultivation in 1800 and was first noted in the wild in Cardiff in 1876. It was recorded in Guernsey in 1897, and in Jersey in 1906. It has spread in Jersey since the 1960s, and also appears to be increasing in England, at least locally; for example, it was first recorded in Somerset in 1989 and is now known from nine 10-km squares.
Native of S. Europe, S.W. & C. Asia & N. Africa; widely naturalised elsewhere.
Atlas Change Index: 1.28
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.