This perennial herb is well-established on old walls and bridges, pavements, and in other well-drained rocky and stony places, often near habitation. It is also found as large, prostrate patches on shingle beaches. It can root from fragments or from nodes, and its seeds germinate readily in brick and stone mortar. 0-450 m (Garrigill, Cumberland).
C. muralis was introduced into gardens before 1602, and records from the wild date from 1640 (Herts.). Comparison of the current map with that in the 1962 Atlas suggests that its distribution is now stable.
Native of the mountains of S.C. & S.E. Europe; widely naturalised through much of temperate and southern 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.