You can also change the sex of the persimmons by grafting so your males can produce fruit you can also choose scion wood that holds fruit later, large fruit, or doesn't ripen until later in the season. This is what I plan to do to a few of our male trees in the next year. Seeds can also be stratified by nicking the coating with sandpaper and keeping in moist peat moss in the fridge. The seeds will produce a long black root radical.