Amending Soil Before Laying Sod: Less Is More

Question: After tree removal, we have moss, muddy areas, and poor drainage. We plan to lay sod organically. Landscaper says 3-4 inches of existing soil is enough; I've heard 10 inches is needed for organic lawns. There's also wood chips from tree removal. What's best?

Expert Advice

Do not add soil or compost. Till the entire area, fix grading for drainage, then lay sod. Do not spread sawdust and chips—they rob nitrogen and lower pH as they decompose. Check pH and adjust to 6.5.

Sod is likely grown in clay, which holds nutrients and water well. Tilling blends topsoil into clay for uniform consistency so sod roots into similar soil. Avoid a loose layer trapped between clay layers—it causes watering difficulties and climate stress.

Plants absorb inorganic nitrogen; microbes must convert organic nitrogen. Tilling loosens soil for roots and encourages microbial growth.