Black-grass occurs throughout much of Western Europe and is an increasing problem in eastern and northern Europe too. In the UK it is most frequent in southern, central and eastern counties but is of increasing concern in other parts of the UK and Ireland.
Distribution of black-grass based on 10 x 10 km grid records (tetrads) in the Atlas of the British Flora (2002).
Source: The New Atlas of the British and Irish Flora. C. D. Preston, D.A. Pearman and T.D. Dines, 2002 (Oxford University Press)