Blue Fescue, Elijah Blue Overview Category: Perennial grasses Common Name: Blue Fescue, Elijah Blue Botanical Name: Festuca glauca 'Elijah Blue' Sun Exposure: Full sun Height: 6-12 in. Spread: 8-12 in. See notes | Back to perennial grasses Notes Small grass with attractive, fine-textured, blue foliage. A cool season grass hardy in Zone 4. Grown primarily for the foliage. In hot spells the foliage may brown out, but revives with the onset of cooler weather. Clump forming.