Blackgrass or black-grass or black grass may refer to:

Plants

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  • Black-grass, British common name for Alopecurus myosuroides, a damaging weed in wheat crops
  • Black-grass rush or blackgrass, American common name for Juncus gerardii, a salt marsh plant used for facing dykes
  • Black mondo grass, a cultivar of Ophiopogon planiscapus

Other uses

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