Although Arborvitae are frost-tolerant, they are easily damaged by snow and wind storms. This can leave frustrating bare spots. Some people cover their shrubs in burlap, but that isn’t very visually appealing. Some experts recommend using thick rope or rubber straps. Don’t use wire as it can scar the plant.
The best approach is to wrap the twine around the outside of the plant like the stripes on a candy cane, starting at the bottom and working your way up. Pull it snug but not so tight that it breaks branches and deforms the shape of the plant.
Remember to remove the rope or straps early in the spring so the tree will grow and move naturally.