YEs Alex, I have heard of the copper wire info and many many years ago at that.
It was Chuck Wyatt who was pushing it and back when I was at the AOL Forum and he and others were at Compuserve, so that gives you an idea of how long ago.
Several folks tried it, two plants mimium of the same vartiety, half with the wire and half without.
I can't say that there was any noticeable difference between the control and wired plants that I remember from feedback.
And think as I might I could not figure out why the copper wire. Still today there are those two footed humans who swear that wearing copper bracelets keeps them more healthy.
For me it's eating chocolate and cashews, not copper bracelets that seems to work.