What Is Proper Spacing For Dark American Arborvitaes

Question From: Merrimack, New Hampshire, United States
Q: What is the proper spacing for 5-6 foot tall Dark American Arborviteas for planting?

A: For use of a hedge space them 4 to 5 feet apart. Current size makes no difference, it's the mature width you want to consider. Best And Happy Yardening, Nancy