Fertilizers all list plant macronutrients according to an NPK scale. This is Nitrogen, Phosphorus and Potassium (K). I use "Miracle Grow" for everything, since it is water soluble. It also contains the trace elements plants need like Iron, Copper and Boron. One disadvantage of Miracle grow is that the Potassium comes as the chloride, which is technically salt. As long as water flushes the potting medium, salt accumulation should be no problem. Regarding pH, alkaline conditions inhibit the uptake of trace nutrients. This is why Miracle Grow adds a chelating agent to overcome the problems associated with hard water.
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NYCorchidman 
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