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Saint Augustine Grass and Herbicides Do Not Mix

by Stephanie Suesan Smith on April 29, 2011

Many people want to know how to kill various weeds in their lawn. If the lawn is Bermuda grass, you can use a product containing 2,4,D to kill all the broad leaf weeds in the lawn. Most of the weed and fertilizer type products contain this herbicide.

If, however, you have Saint Augustine grass, you are out of luck. Anything that will kill the broad leaf plants will kill the Saint Augustine. I saw a very clear example of this during my recent trip to see my parents. We were driving through a residential neighborhood filled with nice homes. House after house had a lush lawn. Suddenly, there was a house where every blade of grass was deader than a doornail. It was obvious they had liberally applied a weed and fertilizer product to their Saint Augustine lawn. I so wanted to take a picture, but because it was someone’s house, did not.

Do not let your lawn be a bad example. Stay away from herbicides if you have a Saint Augustine lawn. Instead, fertilize it appropriately, water it an inch a week, and mow frequently. Weeds do not like frequent mowing. The fertilizer and water will help the grass grow and choke out the weeds.

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{ 3 comments… read them below or add one }

Edgar April 30, 2011 at 5:20 am

I always tell people to stay away from Herbicides as much as they can as there is always a harmless solution to every situation. Thanks for the info
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Stephanie Suesan Smith April 30, 2011 at 6:39 am

I practice, and teach, Integrated Pest Management. I believe that some situations require pesticides or herbicides. Ants in the wiring, invasive plants choking the pasture, and similar situations require immediate attention and extermination. “Harmless” solutions do not kill the problem organism. However, it is important to kill only the problem, and not everything else.

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grace April 30, 2011 at 9:54 am

Wow, this is a very good tip for those who are planning to have a nice and beautiful St. Augustine lawn! Thanks for your advice, I learned another thing today. 🙂

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