Invasive species are those that are not native to our area of the state or country and that spread reaidly and choke out native plants. One of the biggest invasives in this area is garlic mustard. You will find it growing profusely in your yard. You can tell it because it gets a white head of flowers at the top and smells like garlic when you pull it out. These plants should be disposed of properly otherwise they can re-root in the ground and spread further. Other invasices include purple loosetrife and zebra mussels.
