This is the problem and then I’m bombing out/away from this thread cause I’m not changing the flow of it. If anyone would like to read more about persimmon breeding, there’s a thread already:
Is a non-astringent American-Asian hybrid persimmon within reach?
@PharmerDrewee explained the problem of KAKI xAMERICAN to me via a message:
“growing kaki in areas where virginiana are native normally still have seedless fruit unless there’s a male kaki nearby. I believe what’s done is embryo rescue, which yielded JT-02. However, hybrids seem to readily cross between themselves, and back to virginiana or kaki with few issues. This is how all those hybrid seedlings Cliff England has growing out came about.”
Then it has to known/remembered that the northern clade of American Diospyros virginiana is the one to use (thankfully!) because it’s hexaploid. The ploidy of American x Kaki must be hexaploid. Southern American persimmon is a tetraploid. It’s chromosome count that need to be: hex (x) hex and knowing the northern (hexaploid) American persimmon race is cold-hardier, that makes all the difference in creating hardy-hybrids.
Edited for chromosomes/ploidy-count
Dax