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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.
Leylandii will often grow less in the first year as they establish their root systems but growth in their first year can be achieved by watering them regularly over the summer-this means giving the soil around their roots a good soak once or twice a week. Laurel grows up to 60cm (2ft) a year under ideal conditions.t depends on the growing conditions and how far apart you plant them. Under ideal conditions, leylandii should create a good screen after two years growth when planting 120cm+ plants at 60cm apart and it will take about three years at 100cm apart.