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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.
Yellow & brown leaves on my August Beauty Gardenias. I have read through a ton of the postings on this issue already and am not sure what category my poor gardenias fall into--too much water, not enough water, need Magnesium, need Nitrogen, etc. I planted them about 3 weeks ago and fed them Miracle Gro for Acid loving plants at the time of planting.