Answer: I think your new hydrangea is suffering a little transplant shock (brown leaves) and because it is stressed, it is being attacked by insect pests. In a few weeks it will have re-established its root system and you will see new growth. At that time you can prune it back to remove the damaged leaves. Once it is growing vigorously it should not be quite so attractive to insects. Best wishes with your new hydrangea!
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