Answer: Buds that turn black or drop are sure signs that gardenias aren't getting enough light. Bud drop can also be caused by improper soil pH (gardenia require 5 to 5.5pH - on the acid side.) Bud drop can also be a sign of various soil nutrient deficiencies such as nitrogen, zinc, and iron. Finally, if the air is too dry, your plant will drop buds and leaves. Try sprinkling the plant every morning to increase humidity. Hope these suggestions help!
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