Big Bluestem Grass, is a tall, warm season, perennial grass that is grown for its attractive foliage which seasonally changes color. It has an upright clump of stems with flattened leaves that emerge in spring a gray to blue green, the blades mature green with tinges of red in summer and change a reddish bronze with pale purplish tones after the first frost. Flower stems appear in late summer bearing purplish, finger-like flower clusters. Flowering stems make this grass 4-8' tall (usually taller in moist soils and the shorter in dry soils).