Time in Knox County:

2019 Office Hours
Mon, Tue, Thu, Fri: 8:30 am - 4:30pm (mostly)
Wed: 9:00am - 2:30pm

* We try hard to be in the office between 8:30am and 4:30pm on Mon, Tue, Thu, & Fri, but please call ahead to be sure!

893 West St (Rt 90)
Rockport, ME 04856


Invasive Plants


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    Invasive Terrestrial Plants

    The Problem

    Invasive species - whether terrestrial or aquatic plants, marine organisms, or insect pests of forests and farm fields - are defined as non-native species that establish self-sustaining populations,

    • reduce native biological diversity,
    • alter ecosystem properties,
    • threaten the native ecosystems or minimally managed natural areas (or agricultural systems) in which they become established, and/or
    • cause ecological and economic harm or harm to human health

    The Solution?

    We are likely to be living for the rest of our lives with the invasive species that are already well-established in our environment. We can, however, prevent new invasions.

    Maine Department of Agriculture, Conservation and Forestry has taken a big step toward reducing the risks posed by invasive plants.

    • On January 14, 2017, a new rule went into effect, "Criteria for Listing Invasive Terrestrial Plants." This rule establishes criteria for determining if plants are invasive and prohibits the sale, propagation, import or export of listed plants as of Dec 2017. Currently in Maine, 33 plants are considered invasive, likely invasive or potentailly invasive and can be sold onlythrough the end of 2017.
    • See the listed plants HERE.

    What you can do:

    • Get educated - Using the resources on this page, Become familiar with the species native, not native and invasive in the types of natural areas you enjoy.
    • Early Detection, Rapid Response (EDRR) - Become familiar with the species native, not native and invasive in the types of natural areas you enjoy. If you recognize an invasive species in that area, contact whoever it is that manages that area (land trust, state, private individual) and let them know.
    • Purchase and plant only non-invasive species in your home garden.
    • Encourage your local garden center to carry native and non-invasive plants.
    • Inspect and wash your boat when leaving a lake/pond.
    • Do not move firewood from one area of the state to another.
    • Contact your legislator and tell her or him that you are concerned about the threat to Maine's native landscapes by invasive species.

    Invasive Plant Resources

           (For native plant resources: Landscapes and Gardens for Maine)


    Maine Prohibited Plant Poster

    Maine Prohibited Plant List

    Maine Natural Areas Program (MNAP) 

    General info www.maine.gov/dacf/mnap/features/invasive_plants/invasives.htm

     Fact sheets with links to management options  www.maine.gov/dacf/mnap/features/invasive_plants/invsheets.htm

    Map invasive plants www.maine.gov/dacf/mnap/features/invasive_plants/imap.htm

    Maine Invasive Species Network   www.umaine.edu/invasivespecies/

    Invasive Plant Atlas of New England (IPANE - maps showing distribution of invasive plants in New England)  www.eddmaps.org/ipane/

    Massachusetts Invasive Plant Advisory Group (MIPAG)   http://www.massnrc.org/mipag/

    Species ID cards   http://vitalsignsme.org/species-identification-resources

    Giant Hogweed ID: http://www.maine.gov/dacf/php/horticulture/hogweedlookalikes.shtml


    Highly Recommended
           Tallamy, Douglas. 2007. Bringing nature home. Timber Press.

    Invasive plants to avoid
          Kaufman, Sylvan & Wallace. 2007. Invasive plants: Guide to identification, impacts,
          and control of common North American species. Stackpole Books. 

    Somers. Paul, et al. 2008. A guide to invasive plants in Massachusetts. Massachusetts Div. of Fisheries and Wildlife. (http://www.mass.gov/dfwele/dfw/nhesp/publications/nhesp_pubs.htm)

    Uva, Richard et al. 1997. Weeds of the northeast. Comstock Books.

    Native plants to use
          Burrell, Colston. 2006. Native alternatives to Invasive plants. Handbook #45.
          Brooklyn Botanic Garden.

    Cullina, William. Various. Native trees, shrubs, and vines; Wildflowers; Native ferns, moss, and grasses.

    Hightshoe, Gary. 1987. Native trees, shrubs, and vines for rural and urban America. Wiley.

    Leopold, Donald. 2005. Native plants of the northeast. Timber Press.

    Other publications

    Field Guide to Invasive Terrestrial Plants (WI DNR)     PDF

    Mistaken Identity: Invasive Plants & Native Look Alikes   PDF