Erianthus ravennae Common Name: Ravenna Grass, Plume Grass, Northern Pampas Grass, hardy pampas grass. Zones 5 to 8 (perhaps 4 to 10); Full Sun. Mature size 9 to 12 (perhaps to 20) feet height, spreads 6 to 8 feet.Growth Rate: Moderate; upright arching form, Easy to grow Coarse to medium texture gra... See More