i have had a couple of grows with miracle grow and they all went well. One time i even had a couple of plants in MG growing next to some in foxfarm and the mg outgrew the fox farm they were all planted the same day and given the same nutes and watering and sun. How ever even after that i still belive their are far greater soil mixes then Mg, Amature growers have broken down marijuana growing into a science, weed needs the proper Ph for maximum mineral uptake but Mg can still be used

my 2¢