10 Thuja Green Giant Arborvitae 8-12" tall trees Starter Trees in 3" pots with soil and a minimum ht. of 8 inches. Can grow up to 3 ft. a year Mature height: 40-50 ft. Mature width: 20-25 ft. Versatile evergreen plant that can be used as a border, a hedge or a stand alone focal point. Hardy in zones 5-9 and cold hardy to -20 degrees F