DO NOT use Miracle Grow soil. As a new grower I used Miracle Grow in my first grow which made it very difficult to manage nutrients throughout the grow. I also find it get's very compact over time and not very airy at all. WORST of all, my Miracle Grow soil came per-installed with FUNGUS GNATS. At first I thought that they just came in from outside some how, even though my tents are in the basement in a closed room far from the outside. Once I finished that grow and migrated to a high quality peat mix from a hydroponics shop I noticed that I had no gnats in my tents cause I cleaned it all out very well, but still gnats outside the tents in the room that tried to get into my tents every time I opened them. I couldn't figure it out until two months later after battling these gnats and trying to keep them out of the tent I realized that the two bags of Miracle Grow soil I still had in the room had a couple little holes in the bags and the gnats were coming out of the bags!!! I put the bags outside at minus 20C weather and low and behold the gnats are gone in the room, and frozen dead outside I hope. I will never buy that stuff again. It obviously wasn't just the bags I used, but also the bags I didn't use, so that means a whole bunch were infested with gnats. I'll let the wife use that unused soil freezing outside for outdoor pots in the summer. Do not use this stuff if you love your plants.