Managing Winter Desiccation in Leyland Cypress

Browning needle tips on Leyland cypress in Pittsburgh spring are classic winter desiccation (winter burn). Frozen soil prevents root water uptake while winter sun and wind drive transpiration, causing tissue death at needle margins.

Immediate Care

• Wait to prune until new growth emerges—dead tips may sheath live buds.
• Water deeply during spring dry spells; don't rely on rain alone.
• Apply anti-desiccant (e.g., Wilt-Pruf) next November and January per label.

Long-Term Prevention

• Fall hydration is critical: Water thoroughly until ground freezes.
• Mulch 3 inches to moderate soil temperature and moisture.
• Consider windbreaks (burlap screens, not plastic) on exposed sides.
• Select hardier cultivars for future plantings—'Green Giant' arborvitae tolerates Zone 5 better.

Leyland cypress is marginally hardy in Zone 5/6. Some winter browning is normal; the tree usually outgrows it. If entire branches die, the site may be too exposed for this species.