Saving Leyland Cypress from Transplant Shock and Pest Damage

When newly planted Leyland cypress trees begin turning brown in spring after a seemingly healthy winter, transplant shock is usually the culprit. These fast-growing evergreens are particularly vulnerable during their first growing season as they struggle to establish root systems capable of supporting their dense foliage.

The sequence matters: winter winds desiccate foliage while frozen soil prevents water uptake. Come spring, the tree appears to "suddenly" decline. Fertilization in April helps, but consistent deep watering throughout summer is critical. Apply water slowly at the base, allowing it to penetrate 18-24 inches. A fall fertilizer application further supports root development before winter.

The white droppings with larvae you describe warrant investigation. While bagworms are the most common Leyland cypress pest, their distinctive spindle-shaped bags would be visible. Other possibilities include cypress tip miners or scale insects. Collect samples in a sealed container and consult your local cooperative extension's entomologist for precise identification and targeted treatment.

Crucially, remove all burlap from root balls—even the bottom portion. Burlap can wick moisture away from roots and restrict expansion, exacerbating transplant stress. With proper care, most affected cypresses recover fully within a season.