Your gardenia may be receiving too much water, that is, the soil is staying too soggy wet. Of course dry soil is also a possibility. You just have to dig down a few inches and feel the soil to see when it is drying out enough to need watering again. If you have a shady area that is bright and you want to plant the Gardenia outside you can go ahead and do so. If you keep it adequately moist it will be fine there. But it is also okay to grow it in a container as long as the container is very large.
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