Due to improper care or inappropriate conditions for the flower, the following problems may also take place:
If only the lower leaves fall off, then there is no need to worry because this is an entirely natural process associated with the plant's aging. However, if it is not the case, underwatering or overwatering, poor lighting or a sharp temperature change might be the reasons.
As a rule, leaves first turn yellow, die off, and fall off. However, foliage can also change color to yellow due to excessive nutrients in the soil. In this case, rinse the potting mix: add a volume of water that could fill 3 such empty plant pots in which the Ficus grows. After rinsing, feeding is suspended for 8 weeks. Also, it is important not to water the plant again until the potting mix dries to avoid root rotting.
High salinity might be another reason for the change of color. Replanting into fresh soil will help. Huge containers can also cause yellowing of the foliage – do not select too big pots. Finally, yellow leaves can signify that rot has appeared on the roots. If you smell the soil mixture, then it will smell like rot. In this case, remove all the rotten root areas with a sterile and sharp instrument.