miracle grow products--all of themm--are crap.
It doesn't provide all the nutrients mj needs.
You want to be able to provide your plants with lots of N and not much P during veg, the opposite of that when they're in flowering, Too much of one locks out the other, meaning an overdose of one while leaving the plant starving for the other.
I recommend quality potting soil will all kinds of goodies such as worm castings, bat/bird guano, seaweed/kelp, and hydrated lime.
And to go with that, organic nutrients which you will need to add in 8--10 weeks.
P.s. don't add chem. nutes to organic soil, it kills all the good stuff.