Sword grass may refer to:
Some species of grasses with blades that are sharp enough to cut human skin (this is because they contain many silica phytoliths, a hardening material in many plants. The sharp blades help to discourage herbivores from grazing (also protecting the grasses around it)), including: Gahnia species Imperata cylindrica (cogon grass) Poa ensiformis Moths and butterflies: Xylena exsoleta (sword-grass) Xylena vetusta (red sword-grass) Tisiphone abeona (sword-grass brown) Tisiphone helena (northern sword-grass brown)