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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.
For growing gardenias in pots, choose quality potting soil that is light, well-drained and rich in organic matter. You can also use gritty mix soil for it. Clay-rich, water retaining soil must be avoided. Soil must be acidic and pH level around 4.8 â 6 is ideal.