Answer: In my experience, the winters in your area are really just a bit too cold for the Leland Cypress to grow all that well. In addition, they are well known for aggressive and spreading root systems. They also grow fast so would need constant pruning if the mature width is beyond what you have space for. For these reasons I think you would be much happier in the long run with one of the naturally narrow columnar arborvitaes. They can be pruned for height if required although this is a big job requiring ladders (or professional help) so it would be better to select a cutivar that matures ot the size range you need. Degroot's Spire for instance is naturally about 4 to 5 feet wide and 20 feet tall. Emerald is a bit narrower and tops out at about 15 feet. You might also check with your local county extension and professionally trained nursery staff for their suggestions. Good luck with your hedge.
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