Answer: To some extent this depends on how tall you plant to let them grow and on what specific cultivar you are planting. Leyland cypress is potentially quite a large tree; some cultivars grow in the range of 6 to 8 feet wide and 25 feet tall, others to say 15 feet wide and 40 feet tall. They grow quite fast compared to other evergreens and you want to allow them adequate room to become well rooted. You might plant them no closer together than four feet apart measured from trunk to trunk, assuming you will keep them clipped to about ten feet tall and allow them to grow about five feet wide. If you plan to let them grow unpruned, plant them about two thirds as far apart as their expected mature width.
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