A winter-annual which, under favourable conditions, can flower and seed again in autumn. C. hirsuta is particularly common as a weed of cultivation and in other ruderal habitats, but it also grows on rock outcrops, by streams and in woods. 0-1190 m (Breadalbanes, Mid Perth).
The distribution of C. hirsuta is stable, other than in N. Scotland and W. Ireland where it is uncertain whether the concentration of pre-1970 records indicates a real decline or a lack of recording in spring. It was mapped as `all records` in the 1962 Atlas.
Eurosiberian Southern-temperate element, but widely naturalised so that distribution is now Circumpolar Southern-temperate.
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.
Atlas text references
1988. Comparative Plant Ecology.
1986. Atlas of north European vascular plants north of the Tropic of Cancer. 3 vols.
Jalas & Suominen (1994)
1991. Crucifers of Great Britain and Ireland. Botanical Society of the British Isles Handbook no. 6.