Check for bug infestation frequentl

Check for bug infestation frequently. Now that your gardenias are indoors, they will attract many other bugs besides mealybugs and white flies.
Among the bugs to be on the lookout for are aphids, which are small, pear-shaped insects with long legs and antennae.[18] These bugs can be treated with a solution of one-part liquid soap and one-part water. Spray both the top and bottom of the leaves. This treatment is also effective on mealybugs.[19]
Spider mites are small and often hard to see with the unaided eye. To check for spider mites, shake the gardenia gently over a white piece of paper. If you notice red, yellow, brown, or green specs, you may have spider mites.[20] Treat these pests with neem oil, which is vegetable oil from the neem plant. It is available in most grocery or department stores.
Neem oil will also treat infestation of all the aforementioned bugs. If you find your gardenias have yellowing leaves despite these treatments, you may have root nematode infestation. Root nematodes are parasitic, microscopic worms which attack plants at the roots. Unfortunately, there is no treatment for this type of infestation.[21]