Erianthus ravennae HARDY PAMPAS GRASS Seeds! Erianthus ravennae Hardy Pampas Grass Up for bid are seeds of the Hardy Pampas Grass. This is NOT the common Pampas Grass (Cortaderia selloana) which is only hardy to zone 7  this is a cold hardy grass that gets somewhat similar seedheads in fall. It is a beautiful perennial grass that is quite popular. The plant grows up to 12 feet tall gets unique graceful seed heads in late summer to fall and great green foliage all summer. Hardy Pampas Grasses are typically hardy to zone 4. These beautiful plants grow best in full sun to part shade. They would make excellent additions to your rare plant collection, or just make a unique statement in your yard. You are bidding on 10 seeds of Erianthus ravennae.