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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.
Gardenias grow best when they are planted in rich soil that is moist but well-drained. Gardenias do best in soils with acidic pH levels. Try to maintain a pH of 5 or 6. You may want to have your soil tested and then add nutrients according to the results.