It is difficult to control weeds in San Augustine without damaging the St. Augustine lawn. Your options are either to hand pull the weeds or to try and wipe a herbicide on the weeds without getting in on the St. Augustine, which can be quite difficult. You may want to take a sample of the weeds into your County extension office to make sure of their identity and to get suggestions for controlling them. It could be that there is a time of year when they can be controlled without damaging the San Augustine if the correct product is chosen.
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