I am on my first grow and I am using mg potting mix. you will get it to grow but I don't know how much better it does then others. I can tell you this much it dose not have any pertilite in it at all. I just got some. I have been reading over post and the faqs and it all says to use that .... But I stoped at my local home depot today and I seen that have a composted cow manure with humus organic there with pertilite bags too. I am going to get that when I start my next grow.