Every fall the older leaves on my gardenia and hibiscus shrubs turn yellow and drop, what could cause this?
When healthy gardenias and hibiscus are exposed to cool evening temperatures and warm days, it is not uncommon for some older leaves to turn bright yellow and drop. There is no treatment or prevention for this since this is normal. If yellow leaves and leaf drop occur at other times of the year, it is a sign of stress resulting from water stress, improper fertilization, root disorders, nematodes, or misuse of chemicals.
