Blue oat grass is a clump-forming, cool season, ornamental grass that grows 2-3' tall. The foliage gets 2’ tall and wide; whereas the flower stalks get three feet tall. It has very narrow, spiky, steel blue leaf blades that form a round, Urchin-like clump. The Blue Oat Grass resembles that of a blue fescue (Festuca glauca) but is significantly larger. Spikes of bluish-brown flowers hang in an open, one-sided panicle that arches at the tip; appear on upright stems that rise well above the foliage clump in June. Flower spikes mature to a wheat color by fall.