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Regular watering will promote thick foliage and bloom growth. The soil around your gardenia bush should almost always be moist. How often you'll need to water your gardenia bush will depend on how dry the weather is. One of the best times to fertilize your gardenia bush is after you prune it. Use a fertilizer with a a 3-1-2 or 3-1-3 ratio of nitrogen, phosphorus, and potassium. Follow the instructions on the fertilizer packaging for the amount you should use, and mix it into the soil around your gardenia bush. You should look for mealybugs, caterpillars, aphids, whiteflies, thrips, and spider mites. If you see any of these insects on your gardenia bush, try a natural remedy to remove them. If the infestation is bad, you may need to use an insecticide.  To get rid of aphids, spray them with water every 2-3 days until they disappear. For whiteflies and spider mites, try applying neem oil or insecticidal soap to your gardenia bush. Use your hands to pick caterpillars off your gardenia bush

Summary:
Water your gardenias regularly. Fertilize your gardenia bush 2 to 3 times per year. Check for bugs on your gardenias.