hydroponics

I am doing a science fair project on how the type of mulch affects Plant Growth. What topics should I research, other than mulch? I don’t know very much about plants, so I don’t know what about plants I should research. Please help.

How much sunlight a plant gets affecting it’s height
How much water it gets affecting the plant’s growth

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Stuff like that?

Don’t forget to write out a procedure, variables, hypothesis’s, conclusions, charts and graphs and a lab report. That will make your lab report shine.