Answer: All hibiscus have yellow leaves now and then. A few yellow leaves usually only mean that those leaves are getting old and need replacing. If your plant has many yellow leaves it is stressed. The most common causes of plant stress are under-watering, drastic environmental changes or pest invasions, especially spider mites.
Water your hibiscus deeply, then allow the top inch of soil to dry out before watering again; check the undersides of the leaves for aphids and spider mites (spider mites leave little webbing between the stem and the leaf). Hose these pests off if you see them. You can also prune your hibiscus back to encourage healthy new growth.
Best wishes with your hibiscus!
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