Bluestem grass refers to two species: little bluestem (Schizachyrium scoparium) and big bluestem (Andropogon gerardii). Little bluestem is much smaller than big bluestem and is ideal for containers and edging garden borders and pathways. Big bluestem can reach 6 feet high and punctuates gardens with height and color. Both grasses range in color from blue-green in the summer to pinks and red-bronze in the fall.