Black-knapweed. (Common knapweed or Hard heads).   Centaurea-nigra.  Centaurée-noire.France
 

 

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Perennial.

Height.    40 - 70cm

Flowers.  Purple, solitary or branched clusters.

Flowering period.  June - Sept.

Habitat.    Woodland margins, hedgerows, roadsides, wasteland, meadows. Almost anywhere and on most soil types.

Regions in France.   All.

Protection in  France.   None known.