@mamuang seems to reach this conclusion based on taste and size.
@ramv - What are your reasons? I have no reason to second guess your conclusion. I’m just curious about the reasons.
I grafted MB 2 1/2 years ago, mainly because of hype about its non-astringency. I figured I should see for myself. That was probably a mistake – a waste of time and energy.
Bitternut is one of Mother Nature’s cruelest jokes - thin shell, plump kernel, high oil content, but astringent like a green persimmon.
As John Smith wrote about unripe persimmons… “They will draw a man’s mouth awrie with much torment.”
That’s unfortunately also true of some PCNA varieties here – Jiro doesn’t always lose astringency, but Izu appears to. The non-astringency might require a high heat unit accumulation in summer. Morris Burton may be more non astringent in a very hot summer environment.
Usually I have to let everything get a little soft for them to be fully astringent.
how long should a soft american persimmon hold at room temperature without starting to get that fermenting taste?
I had a good chunk of these ones i collected go bad (i was collecting for seedling rootstock anyway) and was just curious.
I thought they would have so much sugar content that they would dry and caramelize first.
I don’t have a direct answer on how long they’ll last, but I do know that before I covered them in a mesh colander (see above picture) I would have some start to ferment if the fruit flies got to them.
Also, if they’re already soft you may want to put them in the fridge for longer storage. When I was down at Edible Landscaping a few years ago they had a lot of their ripe American persimmons stored on flat trays in a fridge.