Vegetables Gardening - Growing Organic Vegetables

A recent reply re: dandelions had a reference to Preen in the original post.  There are at least three different formulas for Preen--one of which: "Preen Vegetable Garden Organic Weed Preventer" is 100% Corn Gluten.  

I've had mixed results with corn gluten as a pre-emergent weed preventer in my garden beds.  Half the time it seems to help but often it seems to fertilize the weeds.

Recently, I came across this informative discussion of corn gluten used on lawns that confirms my experiences with a clear explanation.  (It's mostly a matter of when it's applied.)

http://www.safelawns.org/blog/2010/04/corn-gluten-meal-as-weed-control-20-years-later-the-jury-is-still-out/

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