Clover won't resprout until next fall. Your St. Augustine may return sporadically but you probably should consider resodding or at least putting in strips with about a foot between them so it can fill in by the end of the growing season.
Pre-emergent herbicides can help deter weeds but may not be needed if you will fertilize and water the new grass to get it going fast. If you choose to use a pre-emergent product contact your Parish Extension Agent for some ingredient recommendations that will be effective against the particular summer weeds that are most common in your area.
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