A winter- or, less frequently, spring-germinating annual of dry, basic to somewhat acidic soils in arable fields, bare patches in grassland and lawns, heaths and woodland rides, open ground in rough and waste places, gravel-pits and along railways. 0-610 m (Great Dun Fell, Westmorland).
These annuals occur in arable fields, in thin and open grassland, and in bare patches on rough ground on dry, basic or acidic soils. In all these places, the cover of perennial species is restricted by disturbance or summer drought. 0?610 m (Great Dun Fell, Westmorland).
A winter- or, less frequently, spring-germinating annual of acidic, sandy or gravelly soils in woodland rides, on sand dunes, in sand- and gravel-pits, on tracks and roadside verges; also found in dry rocky places. It tends to replace A. arvensis on less fertile and more acidic soils. Generally lowland, but reaching 380 m at Loch Lee, Glen Esk (Angus).