Hardy Pampas grass is a showy and tall ornamental grass. When mature and planted in the right conditions this ornamental grass can grow up to 12' tall! Hardy Pampas Grass (Saccharum ravannae) does best in well drained soil, and full sun. The large feathery plums appear in late summer and remain through winter, adding much interest during the cold winter months. In fall the foliage turns bronze, adding to the use of this tall ornamental grass. Cut back the foliage of your hardy Pampas Grass in early Spring.