I would not recomend miracle grow. It klled 9/10 of my plants. You might be facing alot of problems if you keep using mg. !st sign of problems from my view is tht your plants stop getting bigger and the tips of your leafs will get nute burns and curl up.....

I had this problem 2 weeks ago and leaned from it! my 1 plant still alive is...serviving...

I wouldnt think that you need plant food yet? Are you watering with tap water or mineral?

peace!