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I have two Parrot Beak trees that were brought home in early Nov.. One was from a nursery in so so condition, one fro a shop with an excellent reputation. Both have the same problem. They both lost leaves in an adjustment phase and with grow light and TLC leafed out well. Now the get plenty of new growth, but as the leaves mature, the fall off. No discoloration, the leaves just fall of, but the new growth continues. They are not over watered, have a stationary spot and are kept under grow lights. I have noticed some tiny bugs flying in the air and hanging in the soil. I also have a leaf drop on a green island ficus that I brought home a month ago. All my other plants are thriving. Thoughts? Thanks

Sounds like a soil problem. How wet do you keep them?

Your mention of tiny flying insects makes me think that you might have fungus gnats in the soil, which can slowly damage plant roots ... and spread to other potted plants that are nearby. It's not uncommon for nursery grown plants to have them. There are biological products on the market that work well. There's also sticky traps, but they only catch the mature/flying gnats and I believe it is the larvae that feed on roots.

Fungus gnats are one of the reasons many people suggest quarantining new plants for a few weeks before introducing them to the general population, or repotting/replacing the soil as soon as possible.

Bunsen33 wrote: Fungus gnats are one of the reasons many people suggest quarantining new plants for a few weeks

Also, fungus gnats are a sign of overwatering.

Thanks for the input!