The Star Tribune is reporting that Brazilian waterweed (Egeria densa) has been discovered in Powderhorn Lake in Minnesota. Officials are surmising the plant most likely came from someone's aquarium. Brazilian waterweed tends to thrive in warmer climates than Minnesota, but the scientists that made the discovery say the plant is already well-established in the lake, and has been there for at least a year. That means it has already managed to survive at least one cold Minneapolis winter.
This is the first record for Brazilian waterweed in the state of Minnesota, and according to this map, looks to be a first for the Great Lakes region as well.