By Annie Thornton.

The main cause of hydrangea yellow leaves is that the plant is constantly being overwatered. The second reason why hydrangea leaves turning yellow is due to chlorosis and the resulting lack of iron.

The other reason for the yellowing of the leaves can be too much sun or a disease of the hydrangea. Apr 24, The most common reasons for hydrangeas leaves turning yellow are fungal diseases, nitrogen deficiency, and chlorosis or lack of iron.

Improper watering and overfeeding can also cause the yellowing of hydrangea leaves. Ensure proper drainage and follow a watering schedule. Feed the hydrangea with Epsom salt and nitrogen-rich fertilizer. Jul 26, All of a sudden many of the leaves have started turning yellow in all areas of the trees (inner, middle and outer). The look/color of the leaves is mostly solid yellow with no green veins when they drop from the tree. Jul 29, Overwatering is the main cause of yellowing leaves in hydrangea plants.

This plant prefers well draining soil that’s kept moist all the time. If the pot is not draining properly, the leaves will start to turn yellow and droopy. Also, too much water leaves the plant soggy, drenched in the root area, and unable to stumpdelimbing.barted Reading Time: 9 mins. I purchased a Limelight Hydrangea just a month ago and some of the leaves are turning yellow and dropping.

(Mostly on the inside of the tree) The leaves also have brown spots with green veins. I am worried I may lose this tree and would love some advice to fix the problem.

I simply love these trees. No but it may be getting too much sun. Leaves that turn yellow -except for the veins which remain green- indicate iron chlorosis. If the leaf and the veins turn yellow then that suggests either too much sun or a nitrogen deficiency.

Having lived in GA for several years, I know that your soil is acid in most places so that rules iron chlorosis.