Corn Gluten Meal is an organic by-product of the corn milling process. It interferes with the seed germination process. It does not kill living plants and adds Nitrogen to your lawn. Apply corn gluten meal at 20 lbs. per 1000 sq. ft., then water. Apply twice a year for 3-4 years, in late April to early May and in mid-August.
For more information, search “corn gluten meal” at the U of M Extension web site: www.extension.umn.edu.