BioSafe Weed Control Concentrate - 32 oz - Non-Selective Herbicidal Soap - Weed Killer - OMRI Listed - Organic - EPA Registered. Safe for People, Pets and the Environment. Kills weeds and grasses within two hours Will not migrate through soil to harm surrounding plants of future growths Gardens may be re-seeded or planted four days after use Organic approved by OMRI, EPA approved 2 fl. oz. covers 200 sq. ft.