Q: I have a potted gardenia in my conservatory. It's one of my favorite plants, mainly for its beautiful, scented flowers. However, some of the lush green leaves have recently turned yellow ...

This yellowing of leaves is sometimes confused with a nutrient deficiency disease called iron chlorosis, especially in the ...

Q: Why are my gardenia's leaves turning black? A: Your gardenias are probably under siege by sucking insects such as aphids or whiteflies. These bugs secrete a sticky honeydew as they feed.