Behind the church, along the fence on the north side of the back parking lot, you'll find a very nice native American persimmon tree full of fruit. The fruits themselves are very small, and very very astringent, but their seeds can be used to grow rootstocks. There are lots of fallen fruits on the ground, and even more ripening in the tree.
I tried a few of the fruits, but they were nowhere near edible. I brought a bag of them home to ripen on the counter, but I'm going to be very careful after my experience last year. The few I tried that were close to ripe didn't taste very sweet, but but with the terrible drought this summer, I'm not surprised that they're not very big or very good. I went by the Fuyu persimmon tree in my neighborhood, but either the owner of the tree or the birds (or both) had already picked the tree clean. If I want some I'll just have to pick them up from Glenn at the City Hall Farmer's Market.