An annual of disturbed, nutrient-rich cultivated and waste ground, often occurring only as a casual. Lowland.
Until about 1940 C. urbicum occurred frequently as a casual, mainly as a seed impurity, and populations persisted in some areas, such as at Ridge in Dorset where it was present for over fifty years. Since 1970 it has only occurred as a rare casual.
As an archaeophyte C. urbicum has a Eurosiberian Temperate distribution.
Light (Ellenberg): 7
Moisture (Ellenberg): 5
Reaction (Ellenberg): 7
Nitrogen (Ellenberg): 7
Salt Tolerance (Ellenberg): 0
January Mean Temperature (Celsius): 4
July Mean Temperature (Celsius): 16.1
Annual Precipitation (mm): 762
Count of 10km squares in Great Britain: 239
Count of 10km squares in Ireland: 1
Count of 10km squares in the Channel Isles: 0
Atlas Change Index: -4.57
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.