11
Aug
Gardenia Leaves Turning Yellow. 1 Spray with Neem Oil mixed with a tablespoon of Hal Soap and spray thoroughly including underside of leaves. During Januaryfed time frame I put the plant in ground and gave a support of a tomato cage as it was. Incorrect temperatures can cause leaves to turn yellow. As gardenia shrubs age the leaves can turn yellow and drop.
So it will be tricky to find out the leaves are turning yellow because of over-watering or under-watering. And use a fertilizer recommended for acid loving plants. Mineral deficiency is one of the major causes of chlorosis in plants and in gardenias the most common deficiencies are magnesium nitrogen and iron which result in the leaves turning from a glossy green shade to a bright yellow. Gardenias need at least 1 inch of rain or equivalent watering each week. Had a lot of green leaves and was about to start forming buds. The fourth growing need sufficient nutrients is met easily enough if such nutrition has been lacking.
The ideal temperature ranges for gardenias is 65 to 70 degrees during the day and 60 to 62 at night.
You really should give your plant one-inch of rain or the equivalent in watering each week. However if gardenias are planted in soil that is too alkaline they are also likely to yellow. Given below are the causes of yellow gardenia leaves and some remedies to stop this yellowing. Two options to try. It occurs on both indoor and outdoor plants. Spray on a cloudy day or when the bush is in the shade.