Answer: Gardenias like plenty of sunshine, but not searing heat. As for pruning them back, your Gardenias should be pinched back in late winter, and again in early spring. I wouldn't take too heavy a hand with the gardenia. I would lightly pinch it back, like an inch or two, and make sure you feed it regularly.
I feed mine every two weeks during the spring and summer with a half-strength dilution of an acidified liquide plant food. In the fall reduce feeding to once a month.
The combination of a light pruning with regular feeding will make it nice and bushy in no time.
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