The Apostle Islands National Lakeshore is a collection of isolated islands in Lake Superior. Its natural beauty brings thousands of people to kayak, bird watch, sightsee, camp, fish, and hike. With these recreationists also comes the potential to introduce non-native plants and animals to new places. One plant of major concern is spotted knapweed. It is a beautiful purple flower, but prevents other plants from growing nearby. It is moved accidently from one island to another by seeds stuck to people and their gear. This video is part of Little Things: big Problems, a series of 5-minute online videos on invasive species in the Great Lakes region that we produced for the National Park Services’ work in association with the Great Lakes Restoration Initiative. The series won a first place Gold Screen Award in the new YouTube category of the National Association of Government Communicators' annual award competition.