The standard in nutrients on any plant food are the N-P-K (example 15-15-15). N is for Nitrogen. P is for Phosphorus. K is for Potassium. There are also ingredients sometimes inside this called trace elements. These may include iron, manganese and zinc. A good plant food will have the proper NPK balance and include the trace elements. In the vegetative state the plant need more nitrogen, usually a good plant food that would be suitable for growing tomatoes will do the job. At the vegetative state look for 20-20-20 NPK. By using more than a teaspoon per gallon of plant food or greatly exceeding the recommended dose you will cause fert-burn (termed from the tips of the leaves becoming very dry as if burnt), which means you have over fertilized, you will quickly see the results in the leaves and the plant may die shortly if you do not quickly over-water the plant and flush/leach the nutrients from the soil or reservoir.
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