C. muralis is a common plant which was introduced for southern or central Europe before the mid 17th century. It grows in walls and on rocks inland or by the sea. It has little "snapdragon" flowers similar to those of the toadflax family such as Common Toadflax (Linaria vulgaris). The leaves are distinctly ivy-shaped but unlike Ivy, small and rather succulent. The flowers are usually predominantly blue but white forms are also known.

Apart from much of far northern Scotland this plant has spread to all other parts of the British Isles and Ireland.

LHS: Newcastle, N. Ireland 21st Aug 2001 Mid and RHS: Great Orme 24 Apr 08 and 15th Apr 06

Added on January 23rd 2005, updated 9th December 2008, upadted 21st March 2010, updated Se3 4th May 2010