Transforming Heavy Clay into a Healthy Lawn

Question: We have about 3/4 acre of heavy clay that we'd like to turn into grass. What can we do to ensure the new lawn thrives?

Initial Preparation

Till the clay to a depth of 6 inches. Incorporate any organic matter—leaves, grass clippings—and existing weeds or grass. Weeds that return are easy to eliminate. Check the soil pH and adjust to 6.5 for optimal turf production. Then sow seed at the appropriate time, keep it watered, and fertilize with a quality turf fertilizer.

Follow-Up: Should You Add Sand or More Organic Matter?

Sand doesn't help much because of the particle size difference between sand and clay. Loosening the clay by tilling is the best approach. Spread an inch of organic matter over the area before tilling to increase organic content by 15-20%. This gives grass roots pathways to follow through the soil. Clay retains water and nutrients well—once loosened, your grass will thrive.