I purchased a small potted tree in a garden center and planted in a larger pot and it was doing fine. It is placed in a sunny location and I live in North FL, I think zone 9 (St. Augustine). I was gone for a week but my husband was home. He watered all my plants during this time but when I arrived home a lot of foliage had dropped off. I see no insects and I fertilized in early April with a product that included insect control. Would you have an idea why it dropped leaves? Thank you, Helen Salanitri
Uneven watering is the most likely cause of leaf drop.
Here are some articles that will help you with care information.