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 »

Oleanders are susceptible to the bacteria Xylella fastidiosa, which causes a yellowing of leaves called leaf scorch. The bacteria is mostly found in southern California and is spread by insects. More »

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There are a number of reasons why a hydrangea plant is unhealthy or not growing as expected. The amount of water or sun the plant receives and other environmental factors can prevent a hydrangea bush or tree from living ... More »

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Properly winterize your endless summer hydrangea plant by creating a cold-weather cover. This keeps the old wood fresh and ready for flowering. You need mulch, garden stakes, a hammer, a staple gun, oak leaves, a bed she... More »

Rose bush leaves can turn yellow when there is an issue with light, water, pests, disease, fertilizer or heat stress, according to Gardening Know How. After yellowing, the bush may lose the leaves entirely. More »