Originally Posted by NattyLawn
Sumagreen won't build organic matter. Screamin Green will, albeit very slowly. That's more of a organic based product, as it contains more N and less OM than other ferts offered in the NP line. If you have some lawns with very low organic matter, try the 6-2-4 at 12-15lbs per k or 4-3-1 at 20lbs per k.
What OM does Screamin' Green have???