Well I finally broke down and bought a 50lb bag. Expensive but worth it. I think this stuff goes a long way. I have been making allot of the 5.1.1. I have been adding one tablespoon of micromax for every 7 gallons of soil. Does that sound about right? One reason I bought this stuff is that it's too expensive too use F.P. on all my annuals. Plus I needed it for my blueberries that are in raised beds. filix.