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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.
Water your gardenias regularly throughout the year absent sufficient rainfall. Keep the soil moist at all times, but not wet. Soggy soil deprives the plant of oxygen, damaging its roots. Do not allow the soil to dry out, since this also damages the shrub's roots.