MG ok, its not great for seedlings tho. idk, go with promix, thats what im doing its good not crazilly priced, and if ur looking to go to wal mart lowes home dep, or some other place like that, u wont find very good soil, MG probably the best they got, and as i said isnt bad at all, ive had very good results with it. but if u want to get serious go to a hydro shop, and get to know the place and product. dnt go in there saying ur lookin for soil but dnt know what to get, bc they will try and sell u the pricyest shit on the rack, same with nutes. i said i wanted to go organic, with just a basic grow and bloom line. the guy trys to sell me nectar of the gods nutes, with like 20 different bottles, for all different types of micro and macro nutes. fuckin 25 bucks each, for the smaller bottles mind u. youd spend well over a 100 for the whole line up. and after i said i only want a basic grow and bloom line. so dnt let them get u, go in there with an idea of what u want. nutes, i would try and find a simple line up, 2-3 parts, (ex veg, early flower, late flower) brand is kinda preference, decide if u want to keep it organic from here on, or go with synthetic fertz, (also u wont find a good nute line up for cannabis in big box stores, another reason to go to a hydro shop) theres alot to review, but keep it as simple as possible. u can feed them after 2-4 weeks, and as for how tall ur plant will get, thats an unknown. hope i helped