Hi Cindy I have found that most grasses are way under rated in their hardyness, here in southwest lower michigain were we are rated zone 6 and at my home in south bend IN.rated zone 5 over half the grasses that I grow are rated zone 7-8 Two good books I would refer are The Encyclopedia of Ornamental Grasses by John Greenlee Rodale Press. Ornamental Grasses: The Amber Wave Carole Ottesen McGraw-Hill Inc. Gary Amber Wave Gardens Benton Harbor MI. zone 6