Several years back, a friend & fellow oak enthusiast did an experiment freezing several hundred Q.alba acorns in a solid block of ice and holding them overwinter in that manner - none survived as viable seeds that germinated. Don't know if that will extrapolate to seeds frozen in a persimmon or not.

Thanks. I guess I'll just have to try it.

Your friend's results do make one wonder, do only those acorns that are deeply buried by squirrels get to germinate? And it would have to be fairly deep burial at the northern edge of the oaks' ranges.