Mushiness in jujubes. My trees are all young and last year was the first experience I had with any “mushy” fruit, and @k8tpayaso is the source for all my knowledge about the phenomenon outside of limited personal experience.
In North Georgia, the only trees affected were two Honey Jars. Maybe 10% of the fruit was affected. The affected fruit looked totally normal in every way, except that they had the firmness of a ripe sour cherry (pretty mushy). I didn’t try any of the mushy ones, but just picked them and tossed them.
In Vegas, I had a few mushy jujubes on my Chico last year, but only like two or three. I tasted one, and it tasted like nothing – no sweetness, no tartness, no bitterness, just nothing. No other trees were affected.
The idea that it is climate-related strikes me as a reasonable guess, but I don’t really know for sure. Whatever it is, it doesn’t seem to be a major problem in either location.
I will note that in Georgia, a jujube that is not picked after ripeness will soon rot on the tree like most other fruit, whereas in Vegas, it will sun-dry into perfectly delicious date that will hang there and remain harvestable for months (if a bird doesn’t eventually swipe it).
Cracking. This is a total non-issue in Vegas for me so far. In the desert climate, the only cracked fruit I’ve seen had their injury started by bird pecks. In Georgia, cracking is more of a problem, and the bigger jujubes (like Autumn Beauty) seemed to be affected worse. Honey Jar and So were affected less.
I agree that the issue is related to rainfall, but I think it has more to do with the variability of rainfall than the absolute amount of water – like from having a heavy rain after a couple weeks without. This is because my Vegas trees are constantly getting all the water they could possibly want, and are irrigated twice or more per day throughout the summer, to the point that the soil is almost always wet or damp. Despite basically unrestricted access to water, their fruit does not crack. My hypothesis is that if you irrigate your trees on a regular schedule (which for my Georgia trees, I do not) then cracking would not be a problem.
Notably, my Georgia Chicos did not have any cracking. This is surprising because the more experienced jujube growers usually point to Chico as being a bit prone to it – and it does produce larger-than-average-sized fruit.
Productivity. In absolute terms, my Vegas trees are more productive, but they are also much bigger (likely an effect of unlimited sun + unlimited water + extra-long growing season). In relative terms, controlled for tree size, I think the North Georgia trees are just as productive.
Jujube fruit size is (so far) noticeably bigger in Vegas. This is remarkable because basically every other type of fruit that I grow in Vegas produces relatively dwarfed fruit compared to the same fruit grown in Georgia. I think it’s a testament to jujubes’ tolerance for extreme heat – the jujubes continue to grow right through the 115+ degree summer days, while most other trees shut down or even start to go into dormancy.
A day’s harvest of jujubes from the Georgia trees (the smaller ones are Honey Jar and the larger sliced ones are Li or Sugarcane):
IMO, jujubes are a tasty, easy fruit to grow and the trees are very resilient and low-maintenance while being precocious and productive. I wouldn’t hesitate to grow them in your location. If you haven’t discovered @BobVance 's jujube threads yet, you should check them out for much more in-depth information.