hydrangeas - Knowledgebase Question

Destin, Fl
Question by jcheerfulsun
July 16, 2010
what is causing large black spots on my hydrangea leaves


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Answer from NGA
July 16, 2010

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Leaf spots are caused by fungi or bacteria. Brown or black spots and patches may be either ragged or circular, with a water soaked or yellow-edged appearance. Insects, rain, dirty garden tools, or even people can help its spread. To prevent and control: Remove infected leaves when the plant is dry. Leaves that collect around the base of the plant should be raked up and disposed of. Avoid overhead irrigation if possible; water should be directed at soil level. For fungal leaf spots, use a fungicide according to label directions.

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