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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.
A plant/tree/shrub marked slow growing will only grow about 6 inches or less a year when established. A plant marked medium will grow between 6 to 12 inches per year. A plant marked fast growing will grow 12 inches or more a year. This assumes the plant is planted in optimum conditions. Factors that will effect growth are, how much sun, morning or evening sun, water and dirt. So too your Boxwood. A boxwood in the Midwest is usually considered a slow grower.