IF you are using one of the potting soils that already has fertilizers in it, do NOT use any fertilizer at all, for the first two months ... if not, you can use the MG ... as already stated, Miracle-Gro is OK to use for your vegging phase, but, DILUTE IT !! .. it is quite strong, and WILL burn up your plants if overdone ... mix it at 1/4 strength, and only use it about every third watering ... watch the tips of the leaves, if they start to 'brown', stop feeding, and go back to plain water ... stop using it at least a week before going into the flowering phase ... nitrogen interferes with flowering ... :smokin: