There are many fruit trees that are considered "self-fruitful" (don't require a second tree for pollination) that thrive here in the desert. An important consideration is the number of chilling hours required for good fruit production. Look for varieties that need less than 300 - 400. Take a look at the list of trees shown to grow and produce well here in Arizona from the University of Arizona at the link below. Here is a link that might be useful: Deciduous Fruits and Nuts for the Low Desert

I have P. Incarnata in one gallon pots. They are small still but grow fast. I live in Fresno Ca. Let me know if your interested.

Nope. Might be better off just learning to hand pollinate them. Good video on how to with Cherimoya (works for Atemoya, should work for Sugar Apple and Custard Apple also). DM

You ALREADY have flowers opening? WOW! I'm no more than 40 miles or so north of you and my flowers have just yesterday erupted. I L-O-V-E sugar apples or I would have yanked them out years ago for more productive fruits to take their place, Anyway, I stopped diddling with my sugar apples past where I can easily reach last year, and got about half as much fruit higher up where I cannot reach to pollinate as where I hand pollinated. Both of my trees are fairly large now with approximately 2.5" and 3.5" trunks at ~9' tall. The smaller one so far always flowers first. Regarding pulling petals, I read that pulling one is sufficient to give insects access. I pulled one petal off of every flower I pollinated to sort of mark which ones I already did. The petal male / female cycle is counter intuitive, from what I've read when they have just opened they are receptive to the pollen and when fully open later in the day they discharge pollen. It's a wonder they survived all these past eons :-) I have also tried defoliating them to see if they push new growth earlier but I cannot say they do. Good luck, keep us posted.