Answer: In my experience it is usually best to transplant hydrangeas in the very early spring, just as the ground becomes workable and while it is still dormant or else in the fall. The reason for this is that the transplant process usually leaves some roots behind and it is stressful on the plant until the new roots grow. Summer heat and dry weather increase the stress, hence the off season timing. If you think you can take nearly all of the roots and replant immediately in a favorable location, and then keep the soil evenly moist all season just as one would with a new plant, you could try it. Be prepared however to have some dieback and trim away the top portion accordingly to balance the top and roots. Good luck with the move!
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