Laying Sod Over Sand in Southern California: Mix Thoroughly

Yes, But Blend the Layers

3–4 inches of sand under 3 inches of topsoil works if you till sand and subsoil together first, then add topsoil + 1 inch compost (3 cu yd/1000 sq ft), and till again. Prevents layered soil that acts unpredictably in heat/drought.

Choose Organic-Rich Topsoil

Ensure topsoil has ample organic matter. The compost boost makes the difference.