Popular pre-emergent products for killing weeds in lawns include Wow! and WeedzStop. Popular post-emergent products for killing weeds in lawns include Weed-Away and Weed Warrior. These products selectively kill weeds without damaging existing lawns.
Pre-emergent weed control products kill weeds just as seedlings begin to grow, before the leaves emerge from the ground. Wow! and WeedzStop both utilize corn-gluten meal, a natural, corn-derived compound. Corn-gluten meal kills young weeds such as crabgrass before they develop. It also benefits lawns by providing fertilizer to existing turf.
Post-emergent herbicides kill weeds after they have fully developed from seed. Weed-Away and Weed Warrior are both systematic herbicides, meaning that they are absorbed into the weed and kill the entire plant. These herbicides are designed to kill broad leaf weeds in lawns.