Ok the reason I said you need a control plant is that you will get NO verifiable or relevant data from this experiment as it is whatsoever, infact if you carry out this experiment in such an unscientific manner and try to give ANY advice based on your "results" theres an extremely good chance you'll be spreading inaccurate and possibly misleading information to the general forum populace...that is why I consider this experiment to be just wrong to be honest. Its not an experiment even, its more just someone doing something different with their plant, if you just did it for yourself without trying to spread the results thats fine cos you can do whatever to YOUR plants but trying to claim to prove anything by this is just taking the pi$$ to be honest.
EDIT: And for the pain analogy above, if your performed the experiment PROPERLY with measuring equipment and a control, then yes you could prove it hurt...much like if the above "experiment" was performed properly it could actually prove something...however as it stands at the minute it can prove NOTHING.