Removing Weeds Before Laying St. Augustine Sod Without Roundup

Organic Weed Clearance for New Sod

A Richardson, TX resident wants to replace a weedy mix of crabgrass, johnsongrass, and thin bermudagrass with St. Augustine sod, but prefers to avoid glyphosate (Roundup). The area is shaded by a large tree.

Recommended Approach

Till the existing weeds into the soil—they become organic matter that feeds the new grass. Check for heavy clay; if present, incorporate cedar bark mulch to improve structure. While tilling, blend in organic amendments such as sugar, alfalfa meal, lava sand, or horticultural cornmeal. Water thoroughly to settle the soil and eliminate air pockets before laying sod.

Why This Works

• Tilling weeds in place recycles nutrients.
• Cedar bark mulch loosens clay and repels some pests.
• Organic amendments feed soil microbes that suppress future weeds.
• No herbicide residue to harm beneficial organisms.