My gardenia bushes have suddenly acquired many very yellow leaves. There is a lot of new growth but almost half of both bushes (side by side) have turned a bright yellow (a few of the yellow leaves have black spots on them as well). What am I doing wrong?
Certified GKH Gardening Expert
Gardenias are notorious for yellow leaves and they are caused by many things. This article has a few suggestions on what could be causing them: