Answer: Cupressus leylandii 'Moncal', the Emerald Isle, is a fast-growing, 20-25' tall evergreen, perfect for windbreaks or tall screens. The ultimate width of the plant is 6'-8'. When they reach maturity, they may be to large for the area you describe. Annual pruning will keep them small for a few years, but eventually they'll become too large to keep under control. A better choice for the garden bed is Swane's Golden Italian Cypress (Cupressus sempervirens 'Swane's Golden'). This is a narrow, columnar evergreen with a mature height of 15-20' and a width of 2-3'
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