Answer: It's normal for newly planted trees and shrubs to show some signs of stress which so if you've recently planted or transplanted your gardenia, that might be what is happening with your newly planted gardenia. Once the roots become established, your gardenia should perk up and replace the lost leaves. If it is still in the nursery container and you have not replanted, this won't apply to your situation. Gardeninas like moist but not soggy soil and high humidity. You might try misting the plant to increase humidity around it. If the air is too dry, the flower buds will drop off without opening. The yellowing leaves may indicate too much/too little water, low humidity, or it could be a natural leaf drop. Because gardenias are evergreen, they eventually drop their oldest leaves in favor of producing healthy new foliage. If the yellowing leaves are on the inner parts of the branches and lower down on the plants, and if you are still seeing healthy new growth, the leaf drop is normal and your plant will produce new foliage within the next few weeks.
Hope this information is hepful!
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