King County has a new mobile app that aims to make it easier for residents to reach local government services. As officials unveil the app this week, they’re highlighting its use in the fight against noxious weeds , for which it has so far been most fully developed. King County has 17 specialists who work to stop the spread of new invasive species and poisonous plants that spread quickly, such as giant hogweed, tansy ragwort or poison hemlock. King County's program tracks dozens of weeds in five