Billy wrote:

Sorry David, but it looks like bullshit to me, thiocyanate is sulfur +
cyanide. Pull the god damn weeds. Don't be a lazy ****. You don't want
to eat heavy metals. Oxalis isn't that invasive, and kids love to chew
it, even if it does bind up calcium.

Billy

Cyanide is carbon and nitrogen bonded (CN) not heavy metals. Whether
thiocyanates on your land are a good idea is another matter that I am
staying out of.

David