Answer: Plants in containers are more vulnerable to cold weather because their roots are above ground. I would highly recommend you plant directly in the ground. If you grow Thuja 'pyramidalis', which is a tall, narrow arborvitae, it will grow up to about 30' in height yet remain only 2-3' in width. Choosing these plants, you can plant them on 4 or 5' centers for a dense hedge which will provide lots of privacy.
Good luck with your plantings!
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