I have never had a tree set flower that produced fruits inside. They all fall off. Could you tell me how to get inside flowers that set into fruits. What is your lighting setup. My citrus are mostly seedless but they get no cross pollination.

I'm not 100% sure what would be different, but I can explain my setup. I guess first, I should mention that I live about 100 ft from a wetland buffer, so that definitely changes the humidity profile in my house. (I can't keep garlic or onions more than a week or two before I have a full blown plant complete with roots sitting on my counter, and my orchids grow aerial roots like crazy and I have one that's been trying to climb our accent wall). I do grow in an organic soilless potting mix that contains bark fines, bark, pumice, and a few other ingredients which include bone meal and bat guano. I can look at the bag, next time I can get to it, as I spent a considerable amount of time going to local nurseries and reading soil mixes until I found one with a profile I liked. I have noticed that mixes that contain bat guano just result in much better growth. My plants are all potted in unglazed terra cotta, though I do this because with the humidity, even a well draining mix just won't dry in plastic. I know somewhere drier plastic can be a help. I use a mix of lights, daylight style LEDs all day during the winter from about 5 AM to 9PM, and then I use the west/southwest window in spring/summer once the days are about the same. The temperature in that room really varies as the heating doesn't really work in that part of the house, so it drops 10-15 degrees every night and can get cold in winter. The coldest I've measured was 45 degrees on a day when temps outside dropped into the single digits. None of my plants were too happy that day. In the summer I still have the 10 degree drop, but temps in the room have gotten above 89 before on really hot days. Usually when it gets that hot, I pull the blinds and use lights as I've noticed my kumquats just seem to resent too much heat. Their room averages about 68-70 during the day year round except for the odd extreme. I give them the occasional dusting of kelp meal for micros and feed them with a chicken manure/feather meal bagged fertilizer mix twice a year. Other than that they never move from where they live other than to be rotated for light. I do keep all my plants elevated over extra large humidity trays filled with lava rock and just let the drainage water evaporate on its own. Hope it helps! Just some of what I've learned in my climate that's given me some pretty good results.

This was part of one I sliced yesterday. Totally seedless.

I've noticed the same thing... My indoor trees produce fruit that are virtually seedless.

I'd be curious if you could grow seedless versions of flavorful yet seedy citrus by simply growing indoors...