What to Do When Gardenia Leaves Turn Yellow? Causes and Solutions

What to do when gardenia leaves turn yellow? This is the question the editor has heard most often lately about growing gardenias. During cultivation, gardenias are prone to yellowing leaves because of oversights in certain areas (such as improper watering, improper fertilizing, poor light conditions, etc.). So how can the problem of yellowing gardenia leaves be solved once and for all?

Causes of Yellowing Gardenia Leaves and Solutions

I. Analysis of the causes of yellowing gardenia leaves:

(1) The factor of improper watering.

If gardenias are watered too much during cultivation, the young leaves will become dull and lusterless, while the old leaves are unaffected, but the leaves will turn yellow-green and new leaves will not grow. The solution is: take the plant out of its pot and place it in a ventilated, shady spot until the root ball dries, then put it back in the pot. When water is lacking, the leaf tips or edges wither and dry out, the old leaves turn yellow and drop from the bottom up, and new leaves grow relatively normally; at this point you should water thoroughly and generously.

(2) The factor of improper light.

Excessively strong light causes yellow spots on the sun-facing side of the leaves, and they recover when placed in a shady spot. If a gardenia is kept in a shaded environment for a long time, the leaves will turn yellow or drop because they cannot get enough sunlight; it is best to supplement the light immediately.

(3) The factor of improper fertilizing.

When growing gardenias, pay attention to fertilizing: too much fertilizer or too high a concentration can easily cause the plant to turn yellow, with brown tips appearing on new leaves. Generally the leaf surface is thick but lusterless, and uneven and not spread out, while the old leaves scorch yellow and drop. At this point you should water more to reduce the fertilizer concentration in the soil. Insufficient fertilizer can also cause the plant to turn yellow, but depending on which nutrient the plant lacks, the symptoms differ.

① Nitrogen deficiency: with nitrogen deficiency the leaves simply turn yellow, and new leaves are small and brittle.

② Potassium deficiency: when a plant lacks potassium, the old leaves turn from green to brown.

③ Iron deficiency: at first the leaves turn pale yellow or white while the veins remain green; in severe cases the veins also turn yellow or white, and eventually the leaves dry up and die. For this situation, you can spray a 0.2%-0.5% ferrous sulfate water solution for control.

④ Magnesium deficiency: the yellowing starts on the old leaves and gradually spreads to the new leaves, the veins remain green, and in severe cases the leaves drop off and the plant dies. You can spray 0.7%-0.8% boron-magnesium fertilizer for control.

⑤ Phosphorus deficiency: the old leaves turn purplish red or dark red.

(4) The factor of too-low temperature. Too-low temperatures can also cause leaf yellowing, so when growing gardenias, pay attention to cold protection in winter, and also keep them warm at night in early spring and early winter.

The above are the causes of yellowing gardenia leaves. Combining the analysis of the causes above, it is not hard to find the solutions. Below we will explain what solutions there are for yellowing gardenia leaves.