Corn gluten meal (often simply called CGM) is a byproduct of corn (maize) processing that has historically been used as an animal feed. In 1985, Dr. Nick Christians of Iowa State University, discovered that CGM displayed pre-emergent herbicidal effects during a series of turf grass experiments. The use of corn gluten meal as an herbicide was patented in 1991, but, like many food-related substances used for gardening, is not regulated in the US.

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  • Corn gluten meal (often simply called CGM) is a byproduct of corn (maize) processing that has historically been used as an animal feed. In 1985, Dr. Nick Christians of Iowa State University, discovered that CGM displayed pre-emergent herbicidal effects during a series of turf grass experiments. The use of corn gluten meal as an herbicide was patented in 1991, but, like many food-related substances used for gardening, is not regulated in the US.
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  • Corn gluten meal (often simply called CGM) is a byproduct of corn (maize) processing that has historically been used as an animal feed. In 1985, Dr. Nick Christians of Iowa State University, discovered that CGM displayed pre-emergent herbicidal effects during a series of turf grass experiments. The use of corn gluten meal as an herbicide was patented in 1991, but, like many food-related substances used for gardening, is not regulated in the US.
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  • Corn gluten meal
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