Hi,
I have a 2 yr old key lime tree that I just bought a few months ago on Amazon. It's flowering ok, but some of the leaves started turning yellow. Not a uniform yellow, but the tips first, and then working down the tips in the meaty part of the leave (the veins are still green). And the flowers have been falling off after blooming. I give it 14 hrs of light a day (led and it's in a sunny window) it has citrus soil and citrus fertilizer. I even started spraying fertilizer on the leaves. The soil seemed like it may have been retaining moisture, so I repotted the tree, still using citrus fertilizer but added a lot of sand to the soil, hoping that it would retain less water. I've only watered it when my finger felt dry soil when I dug a few inches deep. Please help!!! Not sure what's causing the yellow tips!