Scott, the Helpful Gardener himself, promotes the use of native species. He says, and I'm paraphrasing and might have gotten it wrong, that the whole essence of Japanese Gardening is to recreate nature and natural balances. So there is nothing natural about an imported Japanese grass in Sacramento.
The Sacramento area is home to a great many ecosystems, including the wet delta area and the drier climates. It's hot as hell out there, especially out in the Roseville-Rocklin areas. Feels like I'm on Mars during the summer- which is why I'm never going back up there during the summer. lol