One reviewer noted that Preen isn't a crabgrass killer but a preventer. The implication is that this product, even as a sometimes post-emergent treatment, isn't meant to deal with a lawn full of ...

If you apply pre-emergence herbicides too early, the barrier it creates may weaken before the germination window. This leaves ...

Your lawn may grow more than the beautiful grass you intended. It may also grow weeds, which prevent your lawn from looking its best. In addition to reducing the aesthetics of your lawn, weeds compete ...