Ficus trees typically drop leaves for a few reasons. According to Plant Care Today, ficus trees most often drop leaves due to overwatering or underwatering, environmental changes, seasonal changes and pest infestations.
Ficus trees can be fickle when it comes to care. If a ficus tree resides in a sunny area, it is important to give it an adequate amount of water. For ficus trees that are placed in areas with less light, less water is ideal. Moving a ficus tree from outdoors to indoors can also cause leaves to drop. Plant Care Today recommends placing ficus trees in bright areas, and creating a stable care schedule that involves feeding and watering the trees at the same time each day.