Blue fescue grass (Festuca glauca) is a colorful ornamental grass with icy blue foliage and pale yellow flowers. It is drought-tolerant and grows in USDA plant hardiness zones 4 through 8. Gardeners like its ease of care and its fine texture, which makes it a good companion plant for heavier or more dramatic plantings. Unlike some other plants grown as ornamental grasses, F. glauca is a true perennial grass, a member of the Poaceae family. It is different, however, from the tall fescues typically used in turf lawn mixtures.