Green Giant Arborvitae grow to a uniform height and width, making them an easy plant to use for hedges--and spacing can make all the difference in their appearance. Although Green Giants spread to ten to fifteen feet in width, you can plant them closer together to create a dense privacy row. Plant these arborvitae five to six feet apart for optimum privacy--or stagger them into two rows, about four feet apart, allowing the arborvitae to fill in as a living fence. Another choice would be to space your arborvitae further apart to create a less "dense" look. In larger landscapes, these attractive evergreens look great planted on their own as a specimen, or in groups.