Answer: Gardenias like average household temperatures (minimum 60F in the winter), bright light - but no direct sunlight - and moist soil. Use tepid, softened water. Mist the leaves frequently. If the leaves on your plants are turning black, it's a sign of low humidity near the plant, and too much water in the soil. In the winter it's best to water less frequently than when the plants are activiely growing.<br><br>Try to adjust the growing environment and your plants should respond favorably to the new conditions.
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