I have really good luck with alcohol treatment to ripen astringent AND non-astringent persimmons. Just get some cheap whiskey or whatever you want and pour a little in a bowl, then put that bowl in a large container with the persimmons and seal it. As long as the container is sealed, the alcohol will ripen them to be as sweet as they can possibly be. When I do this, it takes about 3-5 days.
How to ripen up persimmons in 3-5 days+ why you should´nt eat crunchy persimmons
Do persimmons ripen if left unripe?
Persimmons continue to ripen and soften once harvested, when left at room temperature. Ripening can be sped up by placing unripe persimmons in a paper bag with ethylene-releasing fruits, such as apples, bananas, or avocados.
How do you ripen a ripe persimmon?
Harvest with Care: Gently twist or cut the persimmons from the tree to avoid damaging the fruit. Quick Ripening Methods: Place unripe persimmons in a paper bag with a ripe banana or apple to speed up the ripening process. Freezing for Ripening: Freeze unripe persimmons and thaw them to enjoy ripe fruit, maintaining their flavor and texture.
When do persimmons ripen?
The key to a sweet, mellow-flavored persimmon is harvesting the fruit after it reaches mature size and color. The flesh will soften in time when the fruit is stored at room temperature. If persimmons are harvested before their size and color are fully developed, they will never fully ripen. No Frost? No Problem
Should you pick a persimmon before it Ripes?
Even if you pick a persimmon before it reaches full ripeness, there are methods to expedite its maturation process. The desire to savor an early ripening persimmon or hasten the maturity of persimmon trees that are mid to late season ripening has led to a range of ripening techniques.