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www.gardeningknowhow.com/edible/helping-a-gardenia-bush-with-yellow-leaves.htm

Wrong pH causing gardenia bush with yellow leaves. Once you determine that water isn’t the issue, you need to check the soil’s pH balance.Soil pH for plants is an important issue for gardenias, which require a pH between 5.0 and 6.5.

www.thespruce.com/gardenia-has-yellow-leaves-4160496

Once you've ruled out diseases and insects, explore the possibility that your gardenia suffers from chlorosis. Chlorosis It can be satisfying to attach a name to a condition, but saying that a plant with yellow leaves has chlorosis really only just begins to tell the story.

www.baliadvertiser.biz/chlorosis

Gardenias are an acid loving plant, so they should not be planted close to concrete, which is a highly alkaline material. Water run-off from concrete will create nutrient problems that can lead to chlorosis and yellow leaves.

www.wikihow.com/Raise-Gardenias-in-Pots

Gardenia (Gardenia jasminoides), also known as Cape Jasmine, is a very fragrant shrub plant with pure white flowers and shiny green close-growing foliage. Gardenias have a reputation as a tricky plant to grow successfully, especially in cooler zones and as houseplants.

www.gardenia.net/guide/Gardenia-Leaves-Turning-Yellow

Iron Chlorosis: Iron is a key nutrient that is used by plants to produce chlorophyll. Gardenias prefer acidic soils with a pH between 5.0 and 6.0. If your soil pH is too high (above 7.0), the iron may not be available to your plant.

hgic.clemson.edu/factsheet/gardenia-diseases-other-problems

Iron Chlorosis: Gardenias are acid-loving plants that grow best in a soil with a pH of 5.0 to 6.0. Iron is an essential nutrient that plants use to produce the green pigment, chlorophyll. Iron is an essential nutrient that plants use to produce the green pigment, chlorophyll.

www.gardenia.net/guide/learn-how-to-grow-and-care-for-your-gardenia

Gardenias growing in containers need bright light or filtered shade with no direct sun. Gardenias grown indoors should receive at least 6-8 hours of direct sunlight through a sunny window. Make sure your Gardenia soil is moist and well-drained. Gardenias need at least 1 inch of rain (or equivalent watering) each week.

www.wikihow.com/Care-for-a-Gardenia

To care for a gardenia, plant it during the spring months in a spot with full sun or light shade. If planting outdoors, dig a hole as deep as the root ball and add mulch around the base of the plant to maintain the moisture in the soil. Indeed, if the soil around your gardenia feels dry, water it to keep the soil moist.

www.searlesgardening.com.au/how-treat-iron-deficiency-azaleas-treatment

Searles Flourish Azalea Camellia & Gardenia Food is excellent for both plants grown in ground or in pots and containers. This soluble fertiliser is best applied at 2-3 week intervals, over the plant foliage and soaking the soil surrounding the roots.

www.gardeningknowhow.com/plant-problems/environmental/leaf-chlorosis-and-iron.htm

Iron chlorosis affects many kinds of plants and can be frustrating for a gardener. An iron deficiency in plants causes unsightly yellow leaves and eventually death. So it is important to correct iron chlorosis in plants.