Caring For Your Gardenias Plant gardenias where they will get morning sun and afternoon shade. Good air circulation is a must. Gardenias prefer moist, acid soil with good drainage & lots of organic matter. When planting, set the root-ball about 1" higher than the surrounding soil. Gently taper the soil up to the top of the exposed root-ball. Mulch. Pests (whiteflies, scales, & mealybugs). can be a problem. Control by applying a light horticultural oil to prevent sooty mold.
What is causing the leaves on my gardenia bush to turn yellow? It is getting plenty of water and is on our screened patio getting the morning sun. It is blooming, but not much. Some leaves are dark green, but some are turning yellow and dying.