I'm not far from Ron but my experience with Kleim's Hardy is different. (I'm about 1 mile from the upper Ches. Bay) It was one of the first plants I bought at the old Styers in 2006 and it had done well until last winter. No damage that I can remember or not enough to remember.
Once difference with how I grow plants is I very seldom fertilize them. So, it had not gotten very big, but it bloomed well most years and seemed hardy. I think this can really make a difference with hardiness, in some cases.
2013-2014 killed it to the ground. It was slow at first to respout, but then picked up so it got back to about 10" high X 20" wide, and pretty fully. About 2 weeks ago realizing this winter still had some surprises, I covered it with burlap as a last minute stab at protection. We shall see.
I agree with the general concern over how these are rated: they are zone 7 hardy, if it's a mild zone 7 like the suburbs of Charlotte or Atlanta. My Kleim's appeared undamaged after the first 3F bout last winter. Each additional freeze caused more visible damage. (my experience wasn't so much delayed damage)
I now want to try 'Grif's', and one more time, in a very sheltered spot, 'Chuck Hayes'. I had a much small CH that I'd only planted the prior spring. (now, of course, I wish I'd kept it inside for a couple more winters) However, adjusting for its much less established state, it didn't seem much more tender than KH. It appeared only minimally damaged by the first 3F.
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