One of the thickest evergreens you may plant is Emerald Green Arborvitae. The hedge gives a tidy, sharp appearance that requires little trimming. This dense evergreen hedge, also known as Thuja occidentalis 'Smaragd,' retains its rich colors and robust form throughout the seasons, making it an ideal hedge choice. This evergreen hedge grows slowly and has stunning green foliage. This highly adaptable tree also thrives in the Southeast's hotter and more humid temperatures, making it a popular hedge in that region as well as the Northeast, Midwest, and West Coast. Visit: www.instanthedge.com/emerald-green-arborvitae/