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 ...

Quali-Pro's Prodiamine 65 WDG provides pre-emergent grass and broadleaf weed control. Flexible application allows for both spring and fall use providing season long crabgrass control. Available in ...