Description: This was formerly known as a weed of arable crops, especially grain crops, but has become very rare with improvements in seed-cleaning techniques. This species is related to the knapweed (Centaurea nigra), but is not a true native to Ireland. (Compare corn-cockle, Agrostemma githago).

All names: Centaurea cyanus L.

Distribution Map from NBN: Centaurea cyanus at National Biodiversity Network mapping facility, data for UK.

iNaturalist: Centaurea cyanus at iNaturalist World Species Observations database.