Water the hydrangea's planting area. Dig a trench around the hydrangea plant at least 6 inches away from the dripline and 6 inches deep. The dripline is the area directly underneath the outermost edges of the hydrangea plant.
Push the hydrangea from underneath with a shovel to lift up the entire root system of the plant through the soil. Use your hands to remove dirt in order to expose any stubborn roots.
Pour a pine bark-based potting mixture into a container. Fill the container up to 1/2 inch from the top with potting medium. Use a container large enough to allow 2 to 3 inches of space between the root ball and sides.
Create a hole inside of the potting mixture for the hydrangea that is 2 to 3 inches wider than the root ball and at same depth as the plant was planted in the ground. Place the hydrangea inside of the hole and pack soil around the base of the plant.
Place the hydrangea container on a saucer with 1/3 of an inch layer of pea gravel to help with drainage.
Water the hydrangea plant by taking the container off of the saucer and pouring water until it drains from the draining hole. Allow the surface of the soil the dry out in between waterings.