Why are my plant's leaves falling off?

Leaf drop is a very common symptom that may result from environmental factors, diseases, or nutritional problems. Depending on the cause, leaves may fall while still green, after turning yellow, or once they have dried, and the process may occur suddenly or gradually. Observing the overall condition of the plant, the roots, and the appearance of the leaves before they fall will help correctly identify the problem and apply the most appropriate treatment.