I picked up this bag of Schultz Potting Soil Plus at Tractor Supply last spring. I wanted to use it to start plants in the house. The bag says "A rich mix of sphagnum peat moss, perlite, composted organic material and a wetting agent" which as near as I can tell means a little peat moss mixed with what could best be termed "mulch" but seems to be wood chips, and some little pellets of some magic chemical. What it seems to do mostly is nothing. About 1 in 30 seeds actually germinated, those that did were spindly and barely grew.
In about July I put some of the mix into a hole in my front yard, in September it looked like this:
Remember I said it looked like much? Thats what it looks like on the ground... Notice how weeds won't even grow on it. I've got 2 other spots in my yard I put this stuff on and those are dead zones too.
I found an Amazon review for the same stuff in a different bag: http://www.amazon.com/Schultz-Purpose-Potting-Soil-20140/product-reviews/B000HAAO04 which mostly echos my experience.
I'm going to write a note to Schultz on their website but don't expect much.