stingy nettle problem

i have tried all weed killers and nothing is working

A systemic weedkiller should do the trick, but you'll need to reapply it annually. Treat in spring when they first appear, as ours are now. You can treat later in the season too by breaking the stems so the weedkiller can get right in.

I make them into soup instead.

A Nettle is a very nutritious crop and makes the best organic feed or even just chop and drop to feed other plants. We are making nettle dumplings and nettel soup. If you start using it you may find its not so much of a problem