There are three reasons the leaves of a hydrangea plant would turn yellow: water issues, nitrogen deficiency and iron chlorosis. Water issues are the easiest to fix, but it is still possible to restore the leaves from th... More »

Brown spots on the leaves of hydrangea shrubs are mainly caused by leaf spot diseases, which can either be fungal or bacterial in nature. Cercospora leaf spot and anthracnose are common fungal infections that affect hydr... More »

Leaves turn yellow because of lack of water and insects. Chlorosis, root issues, lack of nutrients and lack of sunlight are also culprits that cause yellow leaves. More » Science Biology Botany
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Black spots on the leaves of hydrangeas are usually caused by a fungal infection named Cercospora hydrangeae. While these blackened spots are mainly an aesthetic issue, the fungus can reduce vigor in the affected hydrang... More »