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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.
It may be a soft rot caused by a bacteria (Erwinia carotovora), a major disease of calla lilies. Lack of calcium in the soil makes the plant more suseptible to the disease. Once the disease is present in the plant, it must be destroyed to keep the bacteria from spreading.