I have been cultivating persimmon "Vanniglia " for many years. I got it from northern Italy. It flowers and bears fruit reliably after winters that are not too cold. However, late frosts are a problem. When these occur, the young shoots that have already formed flower buds freeze and the new shoots that follow usually bear little or no fruit.
"Vanniglia" fruits are mostly seedless. Very rarely are there seeds that can also be sown. When the fruits turn orange, they are still astringent as long as they are still hard. After harvesting before the heavier frosts, however, they can become soft after several weeks of storage and are then no longer astringent.
You can speed up the ripening or disappearance of the astringent taste by storing them together with ripe apples. These give off a ripening gas, which also causes other fruits to ripen more quickly.
If you have any further questions regarding persimmon "Vanniglia" and also others, I’m happy to help!