Hey Word!... 08, there are generally three kinds of weeds.. grass, sedges, and broad leaves... Herbicides that kill grass can't kill the others... and don't just pull the grass... the roots have several nodes that grow when the mother plant is killed... so, if you kill one grass, around 3-5 will grow back.. If you decide just to pull the grass, make sure you pull all the roots with those nodes along also...