A succulent, mat-forming perennial which may cover sea-cliffs and sand dunes, or hang down rocks and walls. Some colonies were planted to stabilise dunes, while others have arisen from discarded garden material. Reproduction by seed is probably insignificant. Vegetative spread can be assisted by nesting gulls. It is frost-sensitive. Lowland.
C. edulis was being cultivated in gardens by c. 1690, but was not recorded in the wild until 1886. It has spread since the 1962 Atlas but is limited by climate. It is perceived as a serious threat to native species on Cornish cliffs and much effort is spent on its attempted eradication.
Native of S. Africa; widely naturalised in Mediterranean-Atlantic regions of Europe.
Count of 10km squares in Great Britain: 79
Count of 10km squares in Ireland: 8
Count of 10km squares in the Channel Isles: 10
Atlas Change Index: 0.05
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.