I noticed that the trees I have growing out flowered in the fall, but never produced fruit. Is this typical, or did I have a wierd year?
My princess persimmon did the same thing this season.
If you are not getting fruit, you might have one of the sterile hybrids, like x ebbingei.
It might be the plant is not getting enough sun. Elaeagnus growing in shade don't fruit.
The 3 elaeagnus species growing wild in my area all seem to have separate male and female plants. But I am not certain of this necessarily being the case.
In Diospyros, including princess persimmons. The normal case is separate male and female plants. Without pollination, no fruit. If your princess persimmons is from seed, this is probably why no fruit. There are exceptions, some females will bear seedless fruit without a pollinator, but they are rare, and highly sought after. They are propagated by cuttings and get a premium price above seed raised persimmons.