Gardenias are beautiful broadleaf evergreen shrubs but the yellowing of its leaves could mean that they have poor plant health. While you never want to see yellow leaves on your gardenias, it is important to realize that their presence does not always indicate a problem. It's normal to see some yellow leaves as this is simply part of the process of older foliage dying off to make way for new leaves. Check for signs of disease and insect infestations first so that you can rule them out then explore the possibility that your gardenia suffers from chlorosis.

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Source: The Spruce