Maine Invasive Plant Fact Sheets

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Invasive plants in Maine are divided into three groups:

  1. Plant species currently considered invasive in Maine
  2. Plant species potentially or probably invasive in Maine
  3. Plant species highly likely to be invasive, though they are currently unknown from the state

Please note that this listing of invasive plants is informational only. It is intended to provide the reader with information about these species, including identification and potential control measures. It is not a regulatory list.

Please refer to Title 38, Section §419-C Prevention of the spread of invasive aquatic plants for legislation regarding aquatic invasive plant species in Maine. More information about Chapter 273, the new rule for listing invasive terrestrial plants is available at our Horticulture Program.

MNAP developed a series of invasive plant fact sheets, in cooperation with the University of Maine Cooperative Extension. Links in the table will take you to pages where you can get more information about these species, including fact sheets for Maine where they exist, fact sheets for these species from other areas, and informational videos about identification and control. Click on any column header to sort the table by that column. Click again to sort in reverse order.

Scientific Name Common Name Maine Status
Alliaria petiolata Garlic Mustard 1-Currently considered invasive in Maine
Berberis thunbergii Japanese Barberry 1-Currently considered invasive in Maine
Celastrus orbiculata Asiatic Bittersweet 1-Currently considered invasive in Maine
Cynanchum louiseae Black Swallowwort 1-Currently considered invasive in Maine
Elaeagnus umbellata Autumn Olive 1-Currently considered invasive in Maine
Fallopia japonica Japanese Knotweed 1-Currently considered invasive in Maine
Frangula alnus Glossy Buckthorn 1-Currently considered invasive in Maine
Hydrilla verticillata Hydrilla 1-Currently considered invasive in Maine
Impatiens glandulifera Ornamental Jewelweed 1-Currently considered invasive in Maine
Lonicera morrowii Morrow Honeysuckle 1-Currently considered invasive in Maine
Lonicera tartarica Tartarian Honeysuckle 1-Currently considered invasive in Maine
Lythrum salicaria Purple Loosestrife 1-Currently considered invasive in Maine
Myriophyllum heterophyllum Variable-leaf Milfoil 1-Currently considered invasive in Maine
Myriophyllum spicatum Eurasian Milfoil 1-Currently considered invasive in Maine
Phragmites australis Common Reed 1-Currently considered invasive in Maine
Poa nemoralis Wood Blue Grass 1-Currently considered invasive in Maine
Potamogeton crispus Curly Pondweed 1-Currently considered invasive in Maine
Rhamnus cathartica Common Buckthorn 1-Currently considered invasive in Maine
Rosa multflora Multiflora Rose 1-Currently considered invasive in Maine
Acer platanoides Norway Maple 2-Probably invasive in Maine
Aegopodium podagraria Goutweed 2-Probably invasive in Maine
Ailanthus altissima Tree of Heaven 2-Probably invasive in Maine
Amorpha fruticosa False Indigo 2-Probably invasive in Maine
Artemisia vulgaris Common Mugwort 2-Probably invasive in Maine
Berberis vulgaris Common Barberry 2-Probably invasive in Maine
Butomus umbellatus Flowering Rush 2-Probably invasive in Maine
Callitriche stagnalis Starwort 2-Probably invasive in Maine
Cardamine impatiens Cuckoo Flower 2-Probably invasive in Maine
Centaurea maculosa Spotted Knapweed 2-Probably invasive in Maine
Cirsium arvense Canada Thistle 2-Probably invasive in Maine
Cirsium vulgare Bull Thistle 2-Probably invasive in Maine
Cynanchum rossicum Pale Swallowwort 2-Probably invasive in Maine
Euphorbia cyparissias Cypress Spurge 2-Probably invasive in Maine
Euonymous alatus Burning Bush 2-Probably invasive in Maine
Fallopia sachalinensis Giant Knotweed 2-Probably invasive in Maine
Heracleum mantegazzianum Giant Hogweed 2-Probably invasive in Maine
Hesperis matronalis Dame's Rocket 2-Probably invasive in Maine
Humulus japonicus Japanese Hops 2-Probably invasive in Maine
Iris pseudoacorus Yellow Iris 2-Probably invasive in Maine
Lepidium latifolium Perennial Pepperwort 2-Probably invasive in Maine
Ligustrum vulgare Common Privet 2-Probably invasive in Maine
Lonicera japonica Japanese Honeysuckle 2-Probably invasive in Maine
Lupinus polyphyllus Western Lupine 2-Probably invasive in Maine
Nasturtium officinale Watercress 2-Probably invasive in Maine
Ranunculus ficaria Lesser Celandine 2-Probably invasive in Maine
Robinia pseudoacacia Black Locust 2-Probably invasive in Maine
Rosa rugosa Rugosa Rose 2-Probably invasive in Maine
Thymus pulegioides Wild Thyme 2-Probably invasive in Maine
Tussilago farfara Coltsfoot 2-Probably invasive in Maine
Ampelopsis glandulosa Porcelainberry 3-invasive, not currently known from ME
Cabomba caroliniana Fanwort 3-invasive, not currently known from ME
Egeria densa Brazilian Waterweed 3-invasive, not currently known from ME
Fallopia baldschuanica Chinese Bindweed 3-invasive, not currently known from ME
Glyceria maxima English Water Grass 3-invasive, not currently known from ME
Hydrocharis morsus-ranae European Frog's Bit 3-invasive, not currently known from ME
Lonicera mackaii Amur Honeysuckle 3-invasive, not currently known from ME
Lonicera x bella Bella Honeysuckle 3-invasive, not currently known from ME
Microstegium vimineum Japanese Stilt Grass 3-invasive, not currently known from ME
Myriophyllum aquaticum Parrot Feather 3-invasive, not currently known from ME
Najas minor Slender-leaved Naiad 3-invasive, not currently known from ME
Nymphoides peltata Yellow Floating Heart 3-invasive, not currently known from ME
Paulownia tomentosa Princess Tree 3-invasive, not currently known from ME
Persicaria perfoliata Mile-a-minute Weed 3-invasive, not currently known from ME
Phellodendron amurense Amur Cork Tree 3-invasive, not currently known from ME
Populus alba White Cottonwood 3-invasive, not currently known from ME
Pueraria lobata Kudzu 3-invasive, not currently known from ME
Rubus phoenicolasias Wineberry 3-invasive, not currently known from ME
Trapa natans Water Chestnut 3-invasive, not currently known from ME

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