Answer: Since you haven't planted your gardenia, we cannot chalk up the lack of bloom to transplant shock, but the problem may still be related to stress. Gardenias have some very specific growing needs and if these are not met they will refuse to open their flower buds.
For flower buds to form and thrive, night temperatures need to be between 60-65F. During the day, temperatures should be 70-75F. A very constant, even temperature is required or buds will drop or fail to open. Bright light is essential, avoid direct mid-day sun in the summer. Keep the soil moist at all times except winter when watering should be reduced. Mist the leaves frequently, and repot every 2-3 years.
Hope this information answers all your questions. Good luck with your 'August Beauty'!
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