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.
Nigra Arborvitae. The Nigra Arborvitae, also known as the 'Dark Green' Arborvitae, is a hardy, low maintenance tree. It's a great choice as a privacy screen, and perfect as a hedge or natural fence. It is one of the best varieties for cold climates. Unlike some evergreens, 'Nigra' will keep its dark green color all winter long.