Herbs Botanicals

What substances can make plants grow faster? Organic source? Natural source?

Originally my science fair project was "will plants grow faster with coffee extract or a chemical agent. My teacher prefered me not to use coffee. I have not been fortunate in finding something that isn't a fertilizer or what not. She told me instead "use a natural N source and organic N source (i don't know what the N stands for but that's what she wrote on my project proposal). So if you know anything that makes plants grow faster that isn't coffee or a fertilizer educate me!

Plant growth hormones
Subject Plant to proper amount of sunlight and watering
Fertilizer containing Nitrogen, Potassium and Phosphate but in the amounts that best affect your plant, each plant has an optimum amount and if you pass it you may burn the plant, too little may stunt the growth
Oxygenated soil, soil which is porous enough to provide the needed oxygen to the roots.
Plant should be subject to the optimum amount of Carbon dioxide, which in some cases is very affective increase growth.

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