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Other varieties are even taller: It's a stretch to call Pyramidal arborvitae (Thuja occidentalis Pyramidalis) a shrub, when it shoots up to some 60 feet tall and 15 feet wide in zones 3 through 8. Both of these arborvitae grow faster than seems possible.
How to Prune Thuja Arborvitae. Thuja Arborvitae is a hardy, fast-growing, low-maintenance evergreen tree often used in topiaries. Its tall, slim, stately profile make it a great choice for providing a living screen or windbreak when planted side by side in a row.arnings. 1  The best time to prune arborvitae is in early summer after the new growth has fully developed, and again in mid-to-late August. 2  The key to successful pruning is to do little at a time and often. 3  Use sharp, clean pruning tools; this will be less stressful to the tree, which means faster healing.