'Pembury Blue' is generally considered to be the best of the Blue Lawson varieties, so much so that some nurseries have discontinued producing other varieties. The ultimate height of this tree is yet unknown, because it is so new, but thus far its growth habit has shown to be similar to 'American Arborvitae' and 'Pyramid Arborvitae', but it grows much thicker. The silver blue foliage is what really sets this plant off. The color is dazzling! Zone 4-8