A deciduous arching or prostrate shrub, found in rocky grassland and on railway banks, cliffs, limestone pavement, quarries, chalk pits, pavements and walls. It occurs as a garden escape or throw-out, and is also frequently bird-sown. It reproduces readily from seed and is usually very well-naturalised, sometimes even posing a threat to native vegetation. Lowland.
C. horizontalis was introduced into cultivation around 1879 and is extremely popular in gardens. It was first recorded from the wild in 1940. It appears to be increasing rapidly.
Native of W. China.
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.