Answer: Both plants need sunshine in order to bloom. The citrus can spend the summer outdoors in full sunshine; the gardenia will appreciate morning sun and afternoon shade. Unfortunately, gardenia is often a disappointment to gardeners because it can be very, very demanding. 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. 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.
Best wishes with your plants!
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