Soil Preparation for a New Lawn: The Foundation of Success

Turfgrass establishment has three phases: soil preparation (most critical), planting (seeding, sprigging, or sodding), and 2–4 weeks of post-planting care. Soil prep is the same regardless of planting method.

Steps for Proper Soil Preparation

1. Take Soil Samples – Base fertilizer and lime on test results. Contact your county agent for sampling instructions.
2. Clean Planting Site – Remove all debris: rocks, bottles, large roots, old stumps (which decay and leave depressions).
3. Rough Grading – If extensive grading needed, remove topsoil, set rough grade, then replace topsoil. Rough grade should match final grade after topsoil addition. Aim for 1–2% slope (1–2 ft fall per 100 ft) away from buildings. Install drainage/sub-irrigation now if needed. Break up any compacted subgrade (spring tooth harrow for light compaction, rotovator for heavy).
4. Replace Topsoil – Spread topsoil for 6–8 inch settled depth (place 8–10 inches initially). Steep slopes/rock outcrops need 12+ inches. If existing topsoil is poor, amend it.
   • Add 1–3 cubic yards organic matter per 1,000 sq ft (peat moss, shredded pine bark, rotted sawdust 6–8 years old, leaf mold).
   • On heavy soils, add 8–10 cubic yards sand per 1,000 sq ft.
   • Mix all amendments thoroughly with native soil to 6–8 inch depth.
5. Add Fertilizer and Lime – Per soil test. Mix lime into top 3–5 inches. Mix fertilizer into top 1–3 inches or apply to surface. Water lightly before planting.
   • General starter fertilizer: 20–30 lbs commercial grade (5-10-15, 6-12-12, 5-10-10, or 7-14-21) per 1,000 sq ft.
   • If soluble nitrogen: max 1 lb N per 1,000 sq ft.
   • If insoluble (ureaformaldehyde): 3–5 lbs N per 1,000 sq ft pre-plant.
6. Final Grading – Delay until just before planting. Early grading leaches fertilizer and crusts soil. On light (sandy) soils, firm the seedbed to prevent drying. Once prepared, it's time to plant.

Protect Existing Trees

Don't destroy tree roots during tillage – cutting a large percentage can severely damage or kill trees. Don't suffocate roots by deeply covering them with soil. If soil is needed at tree base, construct a tree well.