Answer: I'd try again, this time use a container that is not self-watering. Hydrangea's like moist soil, but it needs to dry out periodically or the roots will suffocate (water drives oxygen out of the soil and roots need to breathe). The moisture control potting mix is okay, just water it thoroughly and then allow the top half-inch of soil to dry out before watering thoroughly again. The wilting you describe indicates over-saturated soil with resulting root rot. As you've discovered, hydrangea leaves wilt in hot sun. They typically recover overnight, or a few hours after you've moved them into a shady spot. You might try filtered morning sun instead of direct morning sun. (Under a tree or arbor, for instance.) Since hydrangeas can be grown indoors, direct sunshine is not absolutely necessary, but bright light. is. Give these suggestions a try. Best wishes with your new hydrangeas!
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