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 ...

To kill crabgrass with salt water ... note that you want to use it sparingly and ensure you don't hit any plants or grass you want to keep because it can alter the soil's pH levels and kill ...

The grass is starting to green up ... There are several products available on the market for crabgrass control. The most widely used products are Barricade, prodiamine, and Dimension, dithiopyr.