Corn gluten acts as a pre-emergent herbicide only and must be applied before weed seed germination takes place. The average application is 20 pounds of corn gluten per 1,000 square feet of lawn. After the seed has germinated, corn gluten feeds the weed and does not kill it.
Corn gluten provides 2 pounds of nitrogen per 1,000 square feet of lawn on average. Apply corn gluten within five days of rain. If no rain falls within that period, water the corn gluten with 0.25 inch of water. Allow the corn gluten a day or two to dry following the watering to deter the seedlings from growing.