Answer: If the plant develops flower buds but they turn brown before opening, the problem is most likely lack of sufficient humidity. Although your plants are getting enough water, the yellowing leaves may need a dose of iron (you can feed with a special gardenia fertilizer which has all the elements these plants crave - look in the fertilizer section in your local Home Depot). Try misting the plants once a day by sprinking the foliage with a garden hose. Between the feeding and the sprinkling, your gardenia should perk right up.
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