Best to spray nut grass with a nut grass specific week killer. Nut grass has a nut (thus the name) deep in the ground that will continue to sprout unless you dig it out our kill it. Bermuda can be spread to your lawn by your gadeners lawn mowers. If they mow anothe lawn that has Bermuda seeds before yours, some of the seeds will cling to the underside of the lawn mowers and fall in your yard.
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