Dollarweed (pennywort) thrives in damp St. Augustine lawns but can be managed with targeted herbicides and moisture reduction.
Three-way broadleaf herbicides provide moderate control. Better results come from products containing carfentrazone or quinclorac—check labels for St. Augustine tolerance.
Dollarweed demands wet soil. Improving drainage or reducing irrigation often suppresses it naturally. Hand-pulling is easy in moist soil and effective for small patches.
Combine approaches: address the moisture issue, spot-treat with effective herbicide, and monitor for recurrence.
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