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.
Light (Ellenberg): 8
Moisture (Ellenberg): 5
Reaction (Ellenberg): 6
Nitrogen (Ellenberg): 6
Salt Tolerance (Ellenberg): 0
January Mean Temperature (Celsius): 3.6
July Mean Temperature (Celsius): 14.6
Annual Precipitation (mm): 1070
Height (cm): 30
Perennation - primary
Life Form - primary
Clonality - primary
Count of 10km squares in Great Britain: 2519
Count of 10km squares in Ireland: 791
Count of 10km squares in the Channel Isles: 14
Atlas Change Index: 0.69
Weighted Changed Factor: 27
Weighted Change Factor Confidence (90%)
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.