Answer: To some extent this is probably seasonal in that the plant is going to slow down and go dormant. Wilting does stress the plant (as does overwatering) and weaken it so some may be stress related, too. This late in the season there is not much you can do one way or the other except keep the soil slightly damp but not sopping wet. In case there is the start of a fungal problem, make sure to clean up all of the fallen foliage once the plant has gone dormant. This would help prevent any carryover to next season. I should mention you will also have to protect your plant for the winter, either by planting it in the ground in a very sheltered location or by bringing it into a sheltered place such as an unheated garage. Frost will not hurt it but you must prevent the rootball freezing. Although root hardy in your area, it needs special care if being grown in a container. Good luck with your hydrangea!
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