The first year(2017-2018, Lullaby for persimmon ) with Ichi, I mulched it with leaves and wrapped it in several layers of the fabric and tarp just to find in spring that it froze out to the mulch level leaving just three live buds. It grew back from these three buds and I built a structure around it, covered the structure with insulation and plywood with a heat lamp(reptiles style), small fan and thermostat inside. I kept temperature above 25 F whole winter long(2018-2019). I continued to cover and heat it lowing min temperature to 15F by the winter of 2020-2021. By the winter 2021-2022 it overgrew the structure and I left it unprotected, but winter was very mild. I had my first and last crop from it this year, we sold the house. So I have no chance to see how it will do in a more harsh winter . I suspect the first year was so bad because it was grown in a very mild climate of California. Better protection needed for young trees, then looks like they do acclimate.