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Suitable for U.S. Department of Agriculture plant hardiness zones 6 through 9, Leyland cypress is a naturally fast grower, growing 20 to 30 feet tall in the first 10 years, and eventually reaching over 50 feet tall and 20 feet wide.
The result is the appropriate planting distance between the Leyland cypress in your hedge. For example, if you plan to keep your Leyland cypress hedge trimmed to 20 feet, you would plant the young trees 5 feet apart. If you want a 16-foot hedge, plant saplings 4 feet apart.