Interestingly, the two products have different active ingredients. BioAdvanced crabgrass killer for lawns is Fenoxaprop-p-ethyl, while the other uses quinclorac. Fenoxaprop-p-ethyl is a post ...
such as BioAdvanced All-in-One Lawn Weed and Crabgrass Killer ($13.98, Lowes). Despite these preventative measures, Clayton says the best bet for crowding out crabgrass is to maintain a healthy ...