The damage typically consists of two to four cupped leaves that are tied together with silk and may occur in a few spots on an individual plant. I have been seeing hydrangeas with two to five of these cupped leaf groups, though you can have more in some situations. If you find the slender green caterpillar, up to ½-inch long, with a blackish head, when pulling apart the leaves, you will verify your problem.
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Curled leaves on hydrangeas? Peek inside for your culprit