That's not very much information to go off of. Where are you growing, are you keeping them in the pots outisde? Are you planning on transplanting at any point? Either way, Miracle Gro is Miracle No! Wow, I should write slogans.

It's not easy to just tell people, you have to learn on your own as well. Buy some books or dvd's, and keep studying around on these boards. You'll learn a lot.