imho, nothing else is the equal of ProMix. I've tried a lot of different combinations of ingredients, and ProMixBX blows them all away in terms of plant production. I think it's the mycorizae, since I've replicated all the other ingredients in my own mixes, to lesser effect. Also, ProMix is pH balanced, which is very necessary in a peat-based growing medium - otherwise you have to do that yourself. I find that ProMixBX plus a scoop or two of compost and a big scoop of TomatoTone is nearly all a pot needs to grow a pepper for the entire season. A few light fets at three week intervals, and presto, productive pepper plant.I would never go back to the alternatives such as MG potting soil, etc.