Across the UK
Carex Nigra. Also known as Black Sedge or Smooth Black Sedge likes sun or part shade, Height 7-70cm, Fruits June-Aug, Drought Tolerant Zone AB
Common Sedge also know as Black sedge is a native, shallow water plant, that has blueish, vertical sword-like leaves. The flower-heads that are distinctively black when they emerge and the resulting seed heads are black too.