Corn gluten is the byproduct of the corn-milling process. It's a fine yellow powder that somewhat resembles corn meal, except that it's less granular. In this form, it is considered unprocessed corn gluten.
Corn gluten as an herbicide is used as a pre-emergent. This means that the corn gluten, in powdered form, is spread on bare earth. It prevents the emergence of weeds by creating a susceptibility to dehydration.
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