Inspect the foliage of your arborvitae. Part the branches with your hands and check for dead branches or limbs.
Cut away deadwood with pruning shears. Remove the remains of foliage that has turned brown.
Hoe the soil around your arborvitae to a depth of 4 inches. Hoeing helps to aerate the earth and allows water to penetrate to the roots of the tree.
Spread a layer of wood mulch around the base of the tree to a depth of 4 inches. The circle of mulch should extend at least 2 feet out from the tree.
Water your arborvitae twice a month during the fall. Give it one heavy watering just before the arrival of the first frost.
Wrap vinyl netting around the tree branches just prior to the season's first frost. Make the wrap snug enough to keep the limbs from sagging. The netting will help prevent the limbs from sagging during snow or ice storms.