Ellen: I had E. pole-evansii in the ground for two winters at the old location and two winters at the new location, both solid zone 6 locations. That said, I don't believe we have gone below 6-7°F in those winters, so they have not been tested through our worst case scenario. I use at least 2" of coarse wood mulch. Mr. Kelly M. Irvin 10850 Hodge Ln Gravette, AR 72736 USA 479-787-9958 USDA Cold Hardiness Zone 6a/b http://www.irvincentral.com/ Ellen Hornig wrote: > Kelly, are you really overwintering pole-evansii outside? I'm going to set > some of those out this year and see how it goes. > > Ellen