Posted: 24/04/2013 at 18:58
Atrovirens is a cultivar, final height 100 feet, half the height of the species, but still taller than an English Oak.
I once planted around 1000 thuja plicata as a catch crop in between beech, to encourage straight stems on the beech trees and to provide stout poles for rustic arches etc.. The thuja were vigorous growers. I also had atrovirens as a garden hedge in a later garden. It's foliage is rather more compact than leylandii, but my feeling is that it will not present well when grown in a pot because it is very hungry and will need to be pruned to keep it to a size that can be confined in a pot, and the foliage isn't tight enough to give it ornamental shape at that size, unlike dwarf conifers, box, holly cultivars etc..
Having said that, you can grow almost anything in pots provided it doesn't have a strong tap root (thuja doesn't).