The habitats where black knapweed~(Centaurea nigra) grows:

Blanket bog
Brownfield
Coastal floodplain grazing marsh
Dune slack
Gateways and tracks
Hard cliff and cliff slope
Limestone pavement
Lowland calcareous grassland
Lowland fen
Lowland meadow and pasture
Machair sand dune
Maritime cliff
Mesotrophic grassland
Northern hay meadow
Nutrient rich around buildings
Purple moor grass and rush pasture
Salt marsh
Sand dune
Scree
Traditional orchard
Upland acid grassland
Upland calcareous grassland
Upland spring flush