41+ Brown Spots On Hydrangea Stems. Fungi and bacteria that cause brown spots on hydrangea leaves spread from fallen diseased leaves or pruned parts of diseased plants; Flowers drying may be because the plant was recently planted and is not used to the summer.
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Other symptoms associated with this disease include yellowing of leaves, premature leaf loss and stunted growth. If your hydrangea has brown spots or rings on its leaves, there is a good chance that it is infected with hydrangea ringspot virus. Yet, you may see black spots on your hydrangea's if your hydrangea blooms are turning brown too soon and quickly petering out, they likely need more water. Ditto if your flowers wilt during the day and.