The fast and powerful root kill action of BioAdvanced Weed & Grass Killer begins working after one hour. Only one application is needed to kill weeds dead so they don’t come back. Not all weed killers are the same. Make the switch. This is a NON-NEONIC product. Reviews There are no reviews yet. Be the first to review “BioAdvanced Weed and Grass Killer Concentrate 32 oz” Cancel replyYour email address will not be published. Required fields are marked *Your rating * Rate… Perfect Good Average Not that bad Very poor Your review *Name * Email * Save my name, email, and website in this browser for the next time I comment.