FWIW, see my comments here. IMO, the cold hardiness of many Kaki varieties has been severely exaggerated based on sporadic random results. Chinebuli is a case study.
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Yeah i think you are right. Plus we have those 20 year record blasts… zone 6 should be focused on hardy hybrids like JT-02, Kasandra, Nb-02, Rosseyanka, etc… Inchon and Korea/Steiermark and maybe Miss Kim are the only kaki i feel good about testing in sheltered locations in 2012 6b any more, along with Nikitas Gift hybrid its max is also sheltered parts of 6b. All other kaki should stay 2012 zone 7 or warmer, most of them should be 7b or warmer.
I have lost most kaki and even a lot of hybrids i have tested 2012 zone 6b, even some supposably good hybrids like Davids Kandy have seen severe damage multiple winters even after growing to a sizeable bush, my nice Sovietski hybrid was totally killed at -12F zone 6b 2012. I plan to only grow the most hardy hybrids from now on.
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