An annual of waste places, railways and roadsides. It is usually casual, but very occasionally naturalised, as in parts of London. It is a common contaminant of bird-seed mixtures. Lowland.
S. loeselii was introduced to cultivation in Britain in 1787. It was first recorded in the wild in 1883 (Middlesex), has only become persistent since the 1940s, and is now probably increasing.
Native of C. & E. Europe, W. & C. Asia; widely naturalised in Europe north and west of its native range.
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