In keeping with the name of this thread..Slowly,but surely...Did you know a copper nail (or pennies, the old ones made of "real"copper, would do the same thing) driven into a tree, will kill it, over time? Copper sulfate is a poison that trees (and other living things!) don't like very much. just in case you need to kill a tree, or stop a stump from "suckering"......just a bit of trivia!.....Arlyn p.s. you need 1 nail (or penny, driven in "edgewise" ) for every 3' of trunk diameter( 4 nails for a 12" tree)......