I don't think Miracle Grow is big problem with seedlings. Its a weed for cripes sake and if a weed can't germinate in it what kind of seeds would grow in it? That said, I hate MG, Scotts, Monsanto like POISON! They are the fucking devil. Personally, I avoid their products. I would continue to use soil rather than rock wool to start if you are going to grow in soil. Buy a bag of seed starter mix (has more fine peat moss).
Are you keeping the lamps close enough to the plants ( like, not two feet, .6 meter away)
Shovelhandle Reviewed by Shovelhandle on . What I Do Now ?? have a 13 day as is from day it sprouted old c-99 female seed I planted that is just barley starting its second set of serated leaves the one that grows three fingers u know . Growing very slow I mean slow compared to others I have done in the past . Its in about a cup of miracle grow soil water it with ph'd water every three to 4 days when it dries out temp 77 to 79 ph is 6.9 lights are on 18/6 one is a cfl hydrofarm 32watt 6500k first time using one of those and two 2 ft t5 floros not sure Rating: 5