A winter-annual of hay meadows, waysides and waste places, and also frequent in lawns. Like T. campestre, it is most frequent in dry grasslands, but can be abundant too in winter-flooded meadows and damp pastures, and can thrive even in fairly nutrient-enriched situations. It also occurs in open habitats such as on rock outcrops, quarry spoil and railway ballast. Generally lowland, but reaching 530 m at Garrigill (Cumberland).
There is no change in the distribution of T. dubium.
European Temperate element; widely naturalised outside its native range.
Light (Ellenberg): 7
Moisture (Ellenberg): 4
Reaction (Ellenberg): 6
Nitrogen (Ellenberg): 5
Salt Tolerance (Ellenberg): 0
January Mean Temperature (Celsius): 3.6
July Mean Temperature (Celsius): 14.6
Annual Precipitation (mm): 1072
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.