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Brown leaves or brown spots are usually due to: 1  Poor drainage: Gardenias love to be moist, but not soaking wet. 2  Not enough humidity for indoor plants: Try using a humidifier in the room where you keep your gardenias.  Not enough sunlight: Gardenias need at least eight hours of full sunlight each day.
Reasons Gardenia Leaves Turn Yellow. The first thing you should do if your gardenia's leaves begin to yellow is have some of the plant's soil tested at your local nursery. This will reveal any possible nutritional deficiencies that could cause this problem. Here are some of the most common reasons for the yellowing.