A perennial herb of calcareous and neutral grassland on well-drained, especially basic soils. It is found in chalk and limestone grassland, in rough pasture, open hedgerows and wood borders, and as a colonist on roadside verges, railway embankments and grassy waste ground. It is also a locally common weed of cultivation, especially in field-borders on the chalk. 0-365 m (Derbys.).
K. arvensis was mapped as `all records` in the 1962 Atlas. Analysis of the database reveals that most of the losses have occurred since 1950. It is included in some wild-flower seed mixtures.
Eurosiberian Temperate element; widely naturalised outside its native range.