Corn Gluten Meal: A Natural Pre-Emergent Weed Control for Lawns

In the mid-1980s, Iowa State University researchers discovered that corn gluten meal (CGM)—a byproduct resembling crunchy cereal—prevents weed seeds from forming roots during germination while feeding turf with a slow-release 10% nitrogen. It's non-toxic to kids, pets, and wildlife.

Effectiveness & Timing

On lawns, CGM stops nearly 90% of certain weeds like crabgrass and dandelions. Apply in early spring before weed seeds germinate. A second application between mid-August and first frost tackles fall weeds. In planting beds, use CGM before setting out summer annual transplants.

Product Sources

Gardens Alive (www.gardensalive.com or 513-354-1482) sells two CGM-based products: Original WOW and WOW Plus, in 5-, 25-, or 50-pound bags ($9–$50).