Hello, Zone 9a/b here. In our garden in town we have huge Valencia Orange Trees, and Yellow Grapefruit Tree (believed to be a Duncan Grapefruit). All produce wonderful amounts of fruit. We planted Guava, Loquat, Olive, Asian Pear, Cherry, and Plum this year all of which grew about 16 inches first year in the ground, the guava almost 20" aside from being extra thirsty during the never ending 100+ heat this summer, they all survived in full sun. We started a few fig trees around the yard, we've had success elsewhere, and these so far have been ok. Blackberry did fantastic in the full sun locations, but terrible in the partial sun areas (which was opposite my expectation) blueberry produced a wonderful first year crop, but may have succumbed to a virus. We have hollyberry, Oregon grape, juniper, quince, all requiring minimal input. We've had fantastic Pomegranates at our prior home and will be planting some cuttings from those this year (same zone). From neighboring yards we get Avocados, persimmons (will plant our own this year as well), and some apples, though these tend to be on the grainy end.
In clarity, taking "Naturally" to mean thriving with little to no pampering; Fig, Avocado (once established), most Citrus, Pomegranates, Loquat, Olive, Pecan (we have volunteer Pecans everywhere, sadly often right next to the house, so they get culled). Short list, but what I have certain knowledge of.
