Challenges - Even in poor soils, Leyland cypress grow an amazing 3 to 4 feet a year when young and it’s entirely possible that they may obtain heights greater than 50 feet when fully grown. Leyland cypress must be trimmed regularly to manage their form and height, starting their first year in the ground. Fortunately, this cypress tolerates severe pruning, but keep in mind that trimming tall hedges tends to be difficult and expensive. Leyland cypress are relatively short lived - typically living less than 50 years. In addition, the species has a disproportionately shallow root system that may cause the tree to topple over in wet soil or strong winds. This fast-growing evergreen also tends to shade out surrounding vegetation. Leyland cypress are not recommended for residential landscape use because even when routinely trimmed, Leyland cypress grow too large.
Trimming- Trim Leyland cypress early and often in life - during dry weather to minimize disease occurrence. Trim just before or during the growing season to avoid extended periods of brown patches on the plant. During the first few years, before the desired height is reached, trim only long side shoots. As the cypress grows larger, begin to trim the top but maintain an inverted wedge form. This encourages proper light distribution from the base to the top of the plant. Leyland cypress may be trimmed as needed up to three times during a single summer growing season.
Spacing - Avoid planting Leyland cypress too close to one another. Specimen Leyland cypress look best when they are allowed to retain their natural, pyramidal shape. For a continuous hedge or screen, provide at least 10 feet between seedlings. The plants quickly grow together, creating an effective visual screen. Provide as much space as possible from surrounding vegetation and structures, taking into account the mature size of the tree when planting.
References:
Ehow: Can You Trim a Leyland Cypress? Christine McLachlan; February 2011
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