Spacing Leyland Cypress for a Privacy Screen

For a 100-foot tall screen starting with 12-foot trees, landscape architect Bruce Holliday recommends two staggered rows, 15 feet apart. A single row at 10-foot spacing gives faster privacy but eventually crowds, turning the interior brown. He strongly prefers 'Green Giant' arborvitae: better structure, less disease, no browning out. At 10-foot spacing, they're ideal.