when to move hydrangea

Answer 1

Depending on your region, this can be done in fall or late winter/early spring. While they can transplant fairly easy, make sure it is done while dormant and get as much of the root system as possible. This article should also help: https://www.gardeningknowhow.com/ornamental/shrubs/hydrangea/growing-hydrangeas-hydrangea-care-guide.htm

This article will help reduce transplant shock: https://www.gardeningknowhow.com/plant-problems/environmental/learn-how-to-avoid-and-repair-transplant-shock-in-plants.htm