Emerald Green, 'Smaragd' ArborvitaeOne of the most famous of the American Arborvitae, this form is considered a semi dwarf cultivar with a compact, narrowly pyramidal habit. This cultivar is most often seen used as a screening hedge, as they are fast growers, while being smaller in stature. While the cultivar name is officially 'Smaragd', the tree is more well known in the USA as 'Emerald Green'. After 10 years in the landscape, a specimen will be considered mature at roughly 6 feet