Question: why are the leaves on my potted gardenia turning yellow?
Answer: If your Gardenia's leaves turn yellow and drop, aside from the normal aging process of its leaves, this may be caused by any of these reasons: Over-watering or under-watering: Gardenias need at least 1 inch of rain (or equivalent watering) each week. ... Don't let the soil dry out and don't over-water your Gardenias.