Grass Giant Miscanthus - grass MISCANTHUS giganteus. 12-14' tall, 3' spread, full sun. Magnificent, gigantic upright clumps of wide green leaves, that is highly valued as a focal plant or a screen plant. Flower stalks soar to 12 foot! Sterile, will not sow. Plant 10 for a 25' tight screen! Zones 5-9. Potted in 3" pot.