Common Knapweed - Centaurea nigra

    Alt Name
    Knapweed and as Black Knapweed

    Medium to tall hairy plant with erect stems, branched or unbranched. Thickened below the flowerhead. Flowerheads purple, 20 to 40 mm, solitary or in branched clusters, the florets all equal in length. Flower bracts with a broad, blackish triangular fringed appendage, concealing the adjacent bracts.

    Identification difficulty

    Roadsides, flower meadows, hedgebanks and waste ground.

    When to see it

    June to September.

    Life History


    UK Status

    Very common throughout Britain.

    VC55 Status

    Very common in Leicestershire and Rutland. In the 1979 Flora survey of Leicestershire it was found in 561 of the 617 tetrads.

    Leicestershire & Rutland Map

    UK Map