Subject: Would Plants react differently to stimulants and depressants than humans?

This is For an experiment that i am doing. I need more information for my 
background research paper.
Would plant growth be spead up if it was watered with a mixture of water and 
some kind of stimulant; and would it slow down if given a depressant.
I Know that plants and humans are in completely different Kingdoms and humans 
have a complex nervous system that plants don't have but would there still be 
an affect.
I was planning on using coffee, Alcohol, and Chocolate in my experiment if 
that helps at all.
Thanks!

Re: Would Plants react differently to stimulants and depressants than humans?