The most cost effective way to get rid of St. Austine grass is to mow it very close and then rototill it 1-2 inches deep a few times during the summer about 2 weeks apart. This will pretty much reduce it to just a few sprigs, especially if it doesn't rain. If the grass is bermuda, zoysia or a native grass you may need to spray with a herbicide product containing glyphosate. Read the label carefully and don't apply more that is needed or apply right before a rain. It works best when the grass is actively growing, not stressed. A repeat application a few weeks later may be needed.
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