Definition of blue oat grass
: a tufted, perennial, evergreen grass (Helictotrichon sempervirens) native to southwestern Europe that is grown as an ornamental for its thin, stiff, grayish-blue leaves and straw-colored, erect, panicled spikelets
- Glimmering blue oat grass makes perfect evergreen hemispheres of icy blue between the stonelike mounds of hebes.
- —Ann Lovejoy, Seattle Post-Intelligencer, 26 June 2003
- Plants such as blue oat grass harmonize with the colors of the flower blossoms and add contrasting shape.
- —Susan Davis Price, Minnesota Monthly, June/July 2005
