wrote:
Anyone ever heard of, or tried, this?

http://www.gardensalive.com/article.asp?ai=544


I tried corn gluten to keep the weeds down in my asparagus patch. It
worked well, but it was very expensive. Preen would have served as
well at a fraction of the cost. NB: corn gluten and Preen are
pre-emergent weed preventers, not herbicides.