Organic Weed Control: Corn Gluten Meal vs. Chemicals

Corn gluten meal (CGM) is a proven, patented pre-emergent herbicide discovered at Iowa State University. It stops germinating seeds from forming roots via five specific dipeptides. Field tests show 60% crabgrass reduction year one, up to 90% by year three. CGM also decomposes into slow-release high-nitrogen fertilizer.

Apply at forsythia bloom (soil ~55°F) for spring weeds; repeat through summer on warm-season turf. It won't kill established weeds—hand-dig dandelions. Thick grass + proper pH + organic nitrogen (Milorganite) prevents chickweed and others. Blowtorch weeds in stone cracks; sour milk works on bluestone.

Chemical lawn products (malathion, weed-and-feed) carry hidden risks—neighbor's "clean bill of health" may not tell the whole story. Organics work with biology; chemicals fight it. The science on CGM is solid, peer-reviewed, and field-proven.