Oh ok yeah thats too bad! I am north of you in south central KS and that Feb blast was something! For yall it was even more unusual. My Kasandra and Davids Kandy and others inground even my Nikitas Gift recieved no damage at all but another person in my area lost their bigger established Nikitas Gift.
Some of your best options for central OK are the most hardy Kaki: Inchon, Korea, and Steiermark. Also Miss Kim and maybe Tecumseh. I plan to put those inground here after I pot grow them another year to gain size and give them their best shot. Once established 2 or 3 years they will be fine for you. For the first 2 or three years I would wrap a cloth sheet around them to shield them a bit. I once lost a small Rosseyanka and Yates to only like -5 so timing and them being small a small tree can freeze off that would have done fine once sized up another year. And you probably wont get a blast like that for a very long time. But those types you had are not the most hardy.
JT-02 hybrid is among the best for mid and upper zone 6.
But in zone 7 OK I would lean toward those most hardy kaki and large hybrid like Gora Goverla and if you want a more hardy hybrid Davids Kandy or JT-02 or JBT-06 are great options you probanly can get scion from Mr Cliff at nuttrees.net
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