Weed Control
Q.

Cornmeal as weed control

Zone 97325 | Anonymous added on November 11, 2017 | Answered

I just read the article on weed prevention using cornmeal. If I use cornmeal in the fall will it act as a pre-emergent before winter? I live in western Oregon. It just rains a lot here in winter and the weeds slow down, but continue to grow. We don't have much of a freeze, if any. If I understand correctly, treatments are effective for 4 weeks?

A.
A.Answers to this queston: Add Answer
Downtoearthdigs
Certified GKH Gardening Expert
Answered on November 11, 2017

The treatment works by preventing weed seed germination, so if you have weeds germinating in the fall, then it can be helpful. University websites state that corn gluten meal is the preferred product over regular cornmeal. These products can be bought in gardening stores or online.
https://www.ipm.iastate.edu/ipm/hortnews/1997/6-20-1997/cornglut.html
http://news.aces.illinois.edu/news/organic-weed-control-corn-meal-gluten

The articles also say that rain will reduce the effectiveness of the treatment, so you may have to re-apply after it rains. It may have a shorter effectiveness period or be less effective in a very wet climate.

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