Invasive plants, plants that grow and spread outside of a desired area, pose unique threats to ecosystems. Invasive plants are non-native species often introduced to an area by humans, and once they spread they are difficult to remove. Invasive plants such as Garlic mustard, Norway maple, and Japanese Barberry can frequently out-compete native species for space, sunlight, and nutrients, and without many natural predators or diseases, these plants can occupy and disrupt a habitat. In Marsh-Billings-Rockefeller NHP, plants like these are currently being managed within the park through both manual pulling (hand pulling and pulling with a weed wrench) and, in rare cases, with herbicide treatment. In this way, the non-native plants can be directly targeted to impact the surrounding native vegetation as little as possible. Boundaries and roadsides in the park are common places to find invasive plant populations; these areas are closely monitored and removal projects are planned accordingly.