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.

MNAP developed a series of invasive plant fact sheets, in cooperation with the University of Maine Cooperative Extension. Links in the tables will take you to those fact sheets where they exist, or to fact sheets for these species from other areas. Click on any column header to sort the table by that column. Click again to sort in reverse order.

Section 1-Plant species currently considered invasive in Maine

Scientific Name Common Name
Alliaria petiolata Garlic mustard
Berberis thunbergii Japanese barberry
Celastrus orbiculata Asiatic bittersweet
Cynanchum louiseae Black swallowwort
Eleagnus umbellata Autumn olive
Fallopia japonica Japanese knotweed
Frangula alnus Glossy buckthorn
Hydrilla verticillata Hydrilla
Impatiens glandulifera Himalayan balsam
Lonicera morrowii Morrow honeysuckle
Lonicera tartarica Tartarian honeysuckle
Lythrum salicaria Purple loosestrife
Myriophyllum heterophyllum Variable-leaf milfoil
Myriophyllum spicatum Eurasian milfoil
Phragmites australis Common reed
Poa nemoralis Wood blue grass
Potamogeton crispus Curly pondweed
Rhamnus cathartica Common buckthorn
Rosa multflora Multiflora or Rambler rose

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Section 2-Plant species potentially or probably invasive in Maine

Scientific Name Common Name
Acer platanoides Norway maple
Aegopodium podagraria Goutweed
Ailanthus altissima Tree of heaven
Amorpha fruticosa False indigo
Artemisia vulgaris Common mugwort
Berberis vulgaris Common barberry
Butomus umbellatus Flowering rush
Callitriche stagnalis Starwort
Cardamine impatiens Cuckoo flower
Centaurea maculosa Spotted knapweed
Cirsium arvense Canada thistle
Cirsium vulgare Bull thistle
Cynanchum rossicum Pale swallowwort
Euphorbia cyparissias Cypress spurge
Euonymous alatus Winged euonymous
Fallopia sachalinensis Giant knotweed
Heracleum mantegazzianum Giant hogweed
Hesperis matronalis Dame's rocket
Humulus japonicus Japanese hops
Iris pseudoacorus Yellow iris
Ligustrum vulgare Privet
Lonicera japonica Japanese honeysuckle
Lupinus polyphyllus Western lupine
Nasturtium officinale Watercress
Ranunculus ficaria Lesser celandine
Robinia pseudoacacia Black locust
Rosa rugosa Rugosa rose
Thymus pulegioides Wild thyme
Tussilago farfara Coltsfoot

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Section 3-Plant species highly likely to be invasive, but not currently in Maine

Scientific Name Common Name
Ampelopsis brevipedunculata Porcelainberry
Cabomba caroliniana Fanwort
Egeria densa Brazilian waterweed
Fallopia baldschuanica Chinese bindweed
Glyceria maxima English water grass
Hydrocharis morsus-ranae European frog's bit
Lepidium latifolium Tall pepperwort
Lonicera mackaii Amur honeysuckle
Lonicera x bella Bella honeysuckle
Microstegium vimineum Japanese stilt grass
Myriophyllum aquaticum Parrot feather
Najas minor Slender-leaved naiad
Nymphoides peltata Yellow floating heart
Paulownia tomentosa Princess tree
Phellodendron amurense Amur cork tree
Polygonum perfoliatum Mile-a-minute weed
Populus alba White cottonwood
Pueraria lobata Kudzu
Rubus phoenicolasias Wineberry
Trapa natans Water chestnut

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