In this week's News of the Weird, park officials in Maryland (I think: The text reads Montgomery County, Md. Canada has only 10 provinces or 13 political units and we use three letter abbreviations, why can't the US with 50 states, use three letters?) are in a quandary. An exotic nuisance plant, mugwort, has invaded their parks and they are trying to get rid of it. Koreans in the area are collecting it (here it's called ssook -쑥) but are being charged with removing plants from a public park.
You are likely to see Korean women collecting ssook almost everywhere in Korea. When my wife sees it, she wants to bring it home but she admits to not knowing how to cook it. I am relieved that she doesn't bring it home, because we usually see it next to busy roads and I don't think I'd care for car-exhaust flavored ssook.