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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.
Answers. Best Answer: 1) 8-10 feet is probably the best choice unless you intend to prune it regularly once it reaches maximum size. Arborvitae tolerate a decent range of soils, so even poor soil quality would likely just slow growth instead of inhibiting it.ince the trees get 20 ft wide (many years later), it sound like 10 ft. 2) How to you top off the tree to restrict its upward growth? I want it maybe 15 ft high, but to get thick/wide. I don't want it to get too tall in case I get bagworms and need to spray the tree.