For 4 – 6 weeks per application, the corn gluten meal in Preen® Natural Vegetable Garden Weed Preventer helps to inhibit seed sprouting and/or root development of the label listed weed seeds. How does Preen ® Natural Vegetable Garden Weed Preventer work? Of course, corn gluten meal will keep any seed from germinating, so don’t try this on your vegetable garden until your plants are established and you’ve finished planting seeds. Corn gluten meal can be incorporated into the soil as a pre-plant treatment or broadcast over existing landscapes. However, you must be careful when using it in your vegetable garden. Current recommendations for use include turf grass landscapes and commercial as well as residential small fruits and vegetable … Corn gluten meal has some interestingly promised characteristics for the prevention of weed growth. With 60 percent protein it is used as feed for livestock, fish and dogs. In the 1990’s, such a product was reported and patented by researchers at Iowa State University. Corn gluten meal is a powdery byproduct of the corn milling process. It can be effective as a pre-emergent herbicide used to control crabgrass and other lawn weeds, and it also has nutritional properties. If people stopped using corn meal on their lawn it’s not like the corn industry would go belly up or any companies specifically selling corn meal … Corn gluten acts as a pre-emergent herbicide and is often spread over lawns to prevent weed seeds from germinating. It’s not like corn gluten meal which is a viable commercial product that can be sold in areas that do not have easy access to a feed store. Corn gluten meal granules, which will disintegrate with time. The Myth of Weed-Killing Gluten: "Corn meal gluten is an effective organic herbicide.” In terms of a holy grail, a safe and effective weed-and-feed product is what every landscape manager continually seeks. For those who don't know - corn gluten meal is the by product of ethanol production;ie, the leftovers from the corn … jill, according to researchers at Iowa State University, a one time application of corn gluten meal on your lawn - before weeds emerged -reduces the survival rates of dandelions, crabgrass, purslane and other weeds by an average of 60%. It poses no health risk to people or animals when used as an herbicide. After several years, the corn gluten meal … Just sprinkle around established vegetables, herbs, and fruits once a month to prevent weeds from returning to your garden. You are correct that corn gluten meal is a great nitrogen fertilizer, containing about 9%N. Pre-emergents are weed killers -- synthetic chemicals or biological substances like corn gluten meal -- that are spread on the growing patch before the crop is planted. 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