Answer: Emerald Isle Leyland Cypress can be pruned to keep it 3-4' wide but you'll need to shear it regularly. If you wait until it reaches that width and then prune it back by a foot, you'll end up with bare areas until it regrows. If you allow the plant to become established and then clip them back by a few inches each year, they will eventually spread out to their full 3-4' width, but will always be covered with fresh new foliage. Best wishes with your new hedge!
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