Answer: It sounds to me as though your plant is suffering from dry indoor air. Gardenias thrive on 68-74 degrees F temperatures in the day, and 60 degrees F evening temperatures. Plants prefer full sun indoors; if grown outdoors for the spring, summer and early fall, keep plants in partial shade. An east or covered west porch will be satisfactory.
High humidity is essential to gardenia care. Avoid misting the foliage, though, as leaf spot fungal problems can develop. You can set the container on a pebble filled tray with about an inch of water in it. As the water evaporates it will add humidity to the air. The soil should be kept uniformly moist, but don?t overwater. A loose, well-drained organic soil is recommended.
Fertilize monthly between April and November with an acid fertilizer.
I'd prune away the dead looking stems and leaves, to make room for healthy new growth.
Best wishes with your gardenia!
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