A beautiful hydrangea can fill in nearly any area of a yard and brighten places next to walls and fences with lush foliage and colorful flowers. Endless summer hydrangeas are particularly attractive because they flower on existing wood and new growth. This makes it that much more important to winterize endless summer hydrangeas so that the existing wood is kept well-protected and makes it through the winter without freezing.
Wait for the first frost for the hydrangea to become dormant and finish dropping leaves. Rake away any old mulch, leaves, twigs or other material from around the base of the plant. Spread a fresh 4-inch layer of mulch around the base of the plant.
Space eight garden stakes around the perimeter of the hydrangea in a circle. Push or hammer them into the ground with a rubber mallet.
Wrap burlap that is the same height as the plants around the stakes. Secure the burlap to the stakes with a staple gun. Fill the area inside the burlap with oak leaves if your winters are extremely cold for weeks at a time.
Remove the burlap, stakes and oak leaves in mid-spring. Cover the plant with a bed sheet through the night if there is danger of frost.