The habitats where common sedge~(Carex nigra) grows:

Blanket bog
Brownfield
Coastal floodplain grazing marsh
Dune slack
Hard cliff and cliff slope
High montane heath and snow bed
Limestone pavement
Lowland dry acid grassland
Lowland dry heath
Lowland fen
Lowland meadow and pasture
Marginal and inundation
Maritime cliff
Mesotrophic grassland
Mountain ledge
Nutrient rich eutrophic lake
Purple moor grass and rush pasture
Raised bog
Saline lagoon
Salt marsh
Sand dune
Turlough and fluctuation mere
Upland acid grassland
Upland acid rush pasture
Upland birch wood
Upland calcareous grassland
Upland lake loch and tarn
Upland rush pasture
Upland spring flush
Upland wet heath
Valley mire
Wet woodland