Corn Gluten

In recent years corn gluten has been touted as an organic solution to weed control.  Researchers at Iowa State University found that in an experiment on lawns that corn gluten worked as a pre-emergent herbicide.  Since then there has been patents awarded and research on a variety of products based on this one study.  It is now sold as a weed control remedy for organic growers and home gardeners.  (http://www.hort.iastate.edu/gluten/?)

Recently researchers at Oregon State University has tried to replicate that experiment and found that corn gluten didn't work as a weed suppressant.  ( http://extension.oregonstate.edu/news/story.php?S_No=956&storyType=garde)

Hopefully new research will come up with more answers in the future.