Answer: The spacing depends in part on how high and wide you want to let it grow and which cultivar you plant. Left unpruned, "Emerald Isle" grows 6 to 8 feet wide and 20 to 25 feet tall, so you might space them 3 to 4 feet apart for a clipped hedge about four feet wide, or plant them about 6 feet apart so they touch at maturity when left unpruned. "Naylor's Blue" is a much larger plant, growing 30 to 40 feet high and 10 to 15 feet wide. If you do not plan on pruning to a formal hedge, you could plant them about 10 to 12 feet apart so they will touch at the sides when they mature. Your local professionally trained nurseryman should be able to discuss this with you as well, depending on the growing conditions at the planting site and your overall landscaping goals for the hedge. Good luck with your planting!
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