I use the soil form of Miracle Grow. Has all the fertilizer mixed in with the loam. I have been using it for years with my houseplants, as well as in the garden and will swear by it (as have many others). I find it to be one of the best out there. I have tried others, only to have my plants die from the bugs that had laid eggs in the soil. I don't know how Miracle Grow does it, but I have yet to have an infestation from their stuff.
I brought home a plant that someone threw out in the dump one day. It was just a bunch of twigs wtih a lone flower and leaf on it that was still green. I don't remember the kind of plant it was, but it was one that I had always wanted, but couldn't afford. I repotted it in Miracle Grow soil and a few DAYS later, the leaves started coming through. I have also used the soil to root cuttings of other plants.