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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.
They can't water during the day so have to water at night. If the soil in the pots dries out during the day this causes stress to the plants. Night time watering breeds fungus on plants. My guess is that the dahlias you purchased were already in the first stages of root rot or disease before they left the store.