Crabgrass killer

This stuff actually works! This AgraLawn Crabgrass Killer is an organic weed killer safe enough to sprinkle into your good grass...and IT WORKS! I bought mine at Barton Springs Nursery, but it's the same price online. (minus shipping)

Results: No explanation needed

It is pricey, since this bottle of powder covers about 200 sq. ft.  I bet spot treatments would be worth it though. 

Be aware, this treatment is a post-emergent, meaning after the weeds have emerged.  Each season, in order to be successful, requires both a pre and post emergent coupled with raising your mower blade to 2" or higher.  I am starting late, with this post emergent, so we'll see.