Areolar Tissue is loose connective tissue that consists of a meshwork of collagen, elastic tissue, and reticular fibres-with many connective tissue cells in between the meshwork of fibres. The fibres that form the mesh structure of areolar tissue include:
Normal growth rates for Emerald Green (Thuja occidentalis 'Smaragd') are between 6 to 12 per year once established and tapering off as they reach about 12' to 15'. I'd be suprised to see more than about 18 per year even in ideal conditions.
Dark American Arborvitae makes a great evergreen hedge or can just stand alone as an accent evergreen in any landscape. It will tolerate clay soils and prefers moist but well drained soil. It can tolerate standing water for a short time. Dark American Arborvitae will tolerate some shade, but not full shade.