Deschampsia cespitosa (Tufted Hair Grass)

From CONPS: Grow this highly ornamental, clump-forming grass in part shade. It prefers a slightly moist soil, and is useful for stabilizing disturbed sites such as streambanks and shorelines. Highly ornamental, tufted hairgrass has fine hair-like flowers rising 2 - 3 feet above neatly rounded, dense tussocks. The grass emerges green and turns gold late in the season, keeping good color and form for winter interest. An excellent shade garden grass, attractive when mixed with ferns. Larval host for various butterflies.