I got interested in the difference between the Hindu swastika and the Nazi swastika. One is a message of hate, while the other is seen as a symbol of peace by millions worldwide.
So, I decided to test if the two symbols could have a bad/good impact on plant growth...
I conducted a plant experiment with the Nazi and the Hindu swastika which can be found here.
I don't think there's anything conclusive, but I think that more work in this area could be useful. I encourage anyone who actually has access to a lab to do this themselves.