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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.
Overview. The Leyland cypress (X Cupressocyparis leylandii) is a fast-growing evergreen tree that can grow in many different soil types. Growing up to 70 feet with a 15- to 25-foot spread, the Leyland cypress has an upright, column or pyramid shape.hen they're planted in a hedge form, Leyland cypress trees usually grow 20 to 30 feet tall and 6 feet wide. The Leyland cypress grows best in USDA hardiness zones 6 through 10, withstanding minimum winter temperatures down to about minus 5 degrees Fahrenheit and tolerating moderate drought.