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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.
Gardenia shrubs can tolerate many kinds of soil, but grow best in soil that is rich in organic matter. Before planting gardenias, add ground bark or compost to the soil. Mix a 3- to 4-inch layer of organic matter into the top 8 to 12 inches of soil.