Western red cedar  

This tree is becoming more and more popular when it comes to coniferous hedges. Thuja plicata atrovirens is a relatively quick growing, easy to prune and shape tree. Its good level of disease resistance coupled with its dark green foliage makes this a good solid choice for a hedge. With high quality resinous timber, it produces a sturdy attractive wood suitable for indoor or outdoor use.

Site: Tolerates some exposure
Soil: Well drained, prefers acid but lime is good too
Position: Full sun
Season of Interest: Evergreen, attractive shape
Hardiness: Fully hardy
Height: 15-20ft (4-5m) Spread: 6-8ft (1.8-2.5m) in 10 years 
50ft + If left grow