Not really sure about ProMix ORGANIC... I use Promix myself and have found a couple of things I didn't know when I started out... first, right out of the bag, the PH is at 7 so adjustments need to be made. Second, it has literally nothing in it... so along with nutes, I also add microbes (add some one week, next week I add molasses to feed the microbes, etc)... My next grow, I'm going to research other mediums because I'm not really in love with this stuff.