Now it is a Weed and Feed product.
Corn gluten meal is a fine-textured or granulated, yellow powder that Iowa State research found to be effective at stopping seed establishment in a wide variety of grasses and broadleaf weeds. It was also tested for herbicide effects on established grasses. Not only did corn gluten meal not damage mature grass, it proved to be an excellent 9% N fertilizer . Broadcast corn gluten meal at about 20 pounds per 1,000 square feet in the spring and again in the fall for pre-emergent weed control. Timing is just before weed germination. It works best if watered in and then allowed to have a dry period. ChemFree+ is 100% corn gluten meal, providing 9% nitrogen fertilizer to your plants, as the product breaks down into organic matter.