April brings us to the ever popular world of Fertilizer 4 Step Programs (and by some definitions 5) and what they do. Turfline and Scotts are the primary two lines in our area. They both vary to some degree in what they do, but that's not what I want to write about today.
I only want to focus on Step 1 of the two lines. Step 1, in a 4 Step Program, contain chemicals that are Crabgrass Preventers. These chemicals kill seed. Because of this, it also creates a problem for putting down new grass seed.
If you use a Step 1 with Crabgrass Preventer, you can't reseed the lawn areas for 120 days. Period. The chemical kills seeds and doesn't know the difference between crabgrass and bluegrass or ryegrass.
Simple and basic....from my Green Thumb to yours.