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I believe somebody mentioned there's a "frost owari" and perhaps more like this with a bit more cold hardiness than even regular owari. Owari tastes fantastic, so definitely worth a try if you are borderline. You could try frost cloth or a popup shelter if you have a really cold night.EDIT - it seems "frost owari" is simply another name for plain "owari". I'm seeing temperature ranges listed from "mid 20s" to "15F for a mature tree". You're probably going to need to protect it on the coldest days or it will never reach the mature-tree stage