This creeping perennial herb of base-poor substrates occurs on rocks, dunes and shingle, and is also known from dry grassland. It is a characteristic plant of open ground on acidic rock outcrops near the sea. It also grows on old walls, rocky hedge banks, and quarries and mine spoil on acidic substrates. 0-1080 m (Snowdon, Caerns.).
The only appreciable change in the distribution of this species since the 1962 Atlas is an increase of inland records, representing escapes from cultivation.
Oceanic Temperate element.
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.