I use MG thru out , but please i am new to this too...i just posted a few pics of mine today...as long as the medium drains well go for it!...the Miracle grow will keep it where they new to be for awhile, IMO..when they start flowering they need the extra help .So if your going to transplant a third time for growing i would use it, if not follow the wiser farmers advice , please. I don't want to cause your babies harm in anyway. And of course your very welcome, we can learn from each other!
happy growing!