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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.
I love Gardenias, but refuse to spray chemicals or cover my plants. Old gardenia plants are insect prone and finicky. Your soil can't be too moist or too dry. Then the occasional late frost comes and wipes out your blooms for the whole season.his Gardenia is great. It is the first of many that I have had that does not drop its flower buds. I have it in the greenhouse in the Fall/Winter, and keep it on the deck in the late Spring and Summer. The flowers really have a great scent and remind us of more tropical climates that we have enjoyed.