Why Are My Plant's Leaves Turning Yellow? (How to Read the Pattern)

Yellowing is a general stress symptom, not a diagnosis by itself. First check whether the potting mix is persistently wet or unusually dry, confirm that the pot drains, note any recent change in light or temperature, and inspect the leaves and stems for pests. Overwatering is common, but drought, unsuitable light, root problems, pests, and other environmental stress can produce overlapping symptoms.