I understand the concept of killing off crabgrass in the fall and over-seeding with a starter fert to get the grass in a more "ready" state for the spring. But don't i have to worry about the crabgrass coming back all over again in the fall? I'm not trying to sound like an idiot, just trying to learn so I can move onto more fine-tuning. I really want the whole darn neighborhood jealous of my lawn. PS: Most everything I've read here leads me to believe that Dimension is going to be the best pre-em, applies about mid-may. Does this also sound about correct?