Answer: Sounds as though your hydrangea is just going through transplant shock. I think it will perk up once it gets used to its new home. Hydrangea's often wilt in the afternoon sunshine even when they're well-established. Such wilting is not a cause for great alarm - the leaves and stems should return to normal by morning. If yours gets direct sunshine in the afternoon provide some protection until it's strong enough to hold its own against the elements.
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