Leyland Cypress Fertilizer: Slow-Release Organic, Soil Test First

20 Leyland cypress (5-gal) planted. Want proper fertilizer/application. Answer: slow, gentle, soil-amending organics. Cheap high-N bags hurt more than help.

Why Organics Win

• Microbes generate steady nutrition, adjust to temp/moisture.
• Chemical fertilizer = salt shock, evaporates, kills helpers.
• 18 Rule: N+P+K ≤ 18 on bag = safe organic range.

Best Sources

• Manure, fish emulsion, blood meal, kelp, alfalfa, cottonseed, greensand.
• Compost + leaf mold in fall breaks down over winter.
• Spring: high-N fish emulsion or blood meal.

Phosphorus & Soil Test Critical

• Bone meal if P low (per test).
• High P soils (West, Northern strip) — don't add.
• Clay, low/high pH, excess Fe/Al lock up P.
• Everything starts with soil test — provide zip for local lab.

Investment trees deserve biology, not bags.