Answer: Yellowing leaves may be normal - gardenias drop their oldest leaves (those near the center and bottom of the plant) just before replacing them with healthy new leaves. If your plant is showing healthy new growth, the yellowing leaves may be just the natural shedding process. If the newer growth is also yellowing, and you haven't fed your plant, now's the time to do so. If you've already fed your plant, it could be that the humidity is too low or your gardenia is getting too much afternoon sunshine. Growing healthy gardenia plants can be a challenge, even for seasoned gardeners. Gardenias require a rich, very acid soil (pH 4.5 to 5.0). An abundance of moisture and high humidity is the most important factor in successful gardenia culture. For flower buds to form and thrive, night temperatures need to be between 60-65F. During the day, temperatures should be 70-75F. A very constant, even temperature is required or buds will drop. Bright light is essential, but avoid direct mid-day sun in the summer. Best of luck with your gardenia!
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