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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 Leyland cypress has a fairly poor root system. It does not have a main taproot, which can make it very unstable in bad weather. The roots are small and very shallow, staying close to the surface of the soil. Additionally, the spread of the roots is minimal, especially for such a large tree.