i seen a post at og,were the grower was using miracle grow pref. soil,after 4weekshe used miracle grow sticks,though i dont recommend it.theres alot of ways to feed plants,fish emulsion,chemicals,all organics,if all organic grow and using tap water,let it sit for 24 hrs,to gt rid of chlorine,that kill the good stuff in ur soil,somties its better to use brand names peeps recommend,lik schultz,fish emusion,jacks classic,at home depoe. check out wat this grower did http://www.cannabis-world.org/cw/showthread.php?t=65