Pruning Leyland Cypress and Boxwoods: Timing and Techniques

Leyland cypress and boxwoods require different pruning approaches. For Leyland cypress, trim side branches annually in July to maintain shape. Once the central leader reaches the desired height, cut it back a few inches below that point to limit vertical growth. Never prune into bare, brown wood—conifers won't regenerate from old wood.

Boxwoods tolerate heavier pruning. Perform major shaping in late winter or early spring before new growth emerges. Light maintenance trimming can be done through summer. Always avoid pruning during active sap flow (early spring) or late summer when new growth won't harden before winter. Remove dead or diseased wood anytime.