Similar to Morphine: The Best Natural Painkiller that Grows in Your Backyard - The article is well written and even gives some historical content on what the painkiller was used for in the past. There is also a great section on other ailments that this backyard weed can help with as well. The nickname is actually called opium lettuce. This is another interesting fact pulled from the short but stout article on the this natural painkiller.