Posted: 11/08/2014 at 17:41
Your grass definitely looks a lot more like pampas grass (Cortaderia selloana) than Stipa gigantea. However, it does look handsome, and it sounds as though you're still quite pleased with it. If you get flowers, you can cut them back in spring and if you fancy doing some propagation, use a sharp spade to divide it in autumn or spring.
These can make a great statement and are much undervalued.
Gardeners' World magazine