Hair grass is a common name for several plants and can refer to:Agrostis hyemalis Agrostis scabra, "hair grass" Aira, hairgrass Aira caryophyllea, silver hairgrass Aira praecox, early hair grass Corynephorus canescens, grey hair-grass Deschampsia, hair grass Eleocharis acicularis, dwarf hairgrass Eleocharis parvula, "hairgrass" Koeleria glauca, Blue Hair Grass Koeleria macrantha, crested hair grass Koeleria vallesiana, Somerset hair grass Rostraria cristata, Mediterranean hair grass