Gardenia bushes are healthy and bloom heavily. But some leaves (10%) turn yellow in spring through fall. Once winter arrives, all the leaves stay green. I spray for aphids and other insects every two weeks and apply fungicide alternating weeks. I try not to over water and the area drains well. Any ideas on what to try next?
Gardenia Leaves Turn Yellow
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: