An annual, rarely biennial, herb, almost exclusively found on arable land in autumn-sown cereals, but sometimes in other arable crops; also on waste and disturbed ground. It is perhaps most frequent on calcareous clays, but is found on a wide range of soils, including sands and gravels. Lowland.
An annual, or rarely biennial, herb of dry neutral and basic soil, found in woodland margins, hedgerows, rough and rank grassland, and on roadside verges. 0-410 m (Craven Pennines, Mid-W. Yorks.).
An annual found in a wide range of dry, sparsely vegetated habitats, including open grassland, sunny banks, sea walls, cliff-tops, arable fields, tracks and waste ground; occasionally in disused sand- and gravel-pits, and on rubbish tips. Lowland.