2nd year maturity. Cortaderia selloana. Pampas Grass Seeds. Non-GMO, Perennial. Open Pollinated. Ornamental. Pampas grass is one of the most popular non-flower ornamental plants in the entire world. Seeds mature to enormous into 6-10 foot tall grassy tussocks with bushy, feathered tips. Pampas grass is native to the plains of South America and readily thrives in a variety of dry and arid climates. Pampas seeds have been a favorite perennial grow for many residential, commercial, and rural spaces. 1000 seed packets.