Crab grass - Knowledgebase Question

Clermont, Fl
Question by mkmalys
August 23, 2010
i was told not to pull crabgrass because you rarely pull up all the roots. What is the proper way to apply baking soda? Do you aim at the roots or sprinkle it all over the crabgrass and how much to use to be effective? Thank you M


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Answer from NGA
August 23, 2010

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I've heard about using baking soda to kill crabgrass and some folks claim it works fine. It is purported that you can wet a patch of crabgrass, pour some baking soda on it, and in less than a day find the weed dead but the surrounding grass fine.

I agree that baking soda should kill weeds. It is a salt, and would have the effect of drawing moisture out of a plant?s leaves. Once that happens the foliage dies. The root would not typically die, unless it was a young plant. So baking soda is capable of killing weeds, including crabgrass, but with only one application it usually will not be permanent.

The question is whether or not the surrounding grass would be hurt. A number of sources claim it will be hurt and others claim baking soda does not hurt St. Augustine. I?ll reserve judgment because I don?t currently have any St Augustine grass to experiment on.

You may be inclined to try it. If so, I would encourage caution. Try a sample test on a small patch of lawn to see what happens.

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