Invasive plant species are a non-native species that have spread into minimally managed plant systems in Massachusetts. These plants cause economic or environmental harm by developing self-sustaining populations that dominate and/or disrupt native plant systems. (Massachusetts Invasive Plant Advisory Group). The term "invasive" is used for the most aggressive non-native species; these species grow and reproduce rapidly, causing major disturbances.

Most invasive plants were introduced to Massachusetts for use in landscaping and gardening. Because they have been relocated from their native habitats, there are no natural mechanisms to control their populations, which allows them to reproduce rapidly. When allowed to take over native habitats, invasive plants eventually change how the ecosystem functions.

Here in Newburyport, our parks have been impacted by at least six invasive plant species, and likely more. These species are reproducing rapidly in portions of our parks, and it is difficult for City staff and volunteers to eradicate them.

The Port Parks Alliance drew upon various sources to collect information about each invasive plant species. These include Mass Audubon, Mass Division of Fisheries and Wildlife, and the Native Plant Trust.