| 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.
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