I need help. I bought 6 fig trees. One is still with me after 3 1/2 yrs, but I never had fruit on it. It's over 4 feet tall, and I bring it in over winter. I live in Illinois, 45 miles south from Chicago. I used root grow 4-10-3 a lot on it. It makes it grow better, but no fruit. I have another new fig tree that's a foot tall and it has fruit on it, so why is my large fig tree not fruiting? Is it because of root grow? I use it to get it to grow better. The other fig tree, my new one, is a year old. I just got it 3 months ago. The leaves fall off, so I did not know if it was dying or not so I used root grow on it. It helped a lot but now it has a white trunk and leaves. Doesn't look that good and a little brown in spots. Hope you can help.
Fig Tree Mission
Certified GKH Gardening Expert
For the non-fruiting fig, it may be a nitrogen/phosphorus imbalance in the soil. Too much nitrogen and too little phosphorus can result in little to no blooming, which means no fruit. This article should help: https://www.gardeningknowhow.com/edible/fruits/figs/fig-tree-is-producing-fruit.htm
For the other fig, the leaves dropping sounds like a fungus. Start the tree on a fungicide treatment. Also, make sure to clean up and dispose of any fallen leaves.