Click below to view the Connecticut Invasive Plant List. The list includes Invasive and Potentially Invasive Plants as determined by the Connecticut Invasive Plants Council in accordance with Connecticut General Statutes §22a-381a through §22a-381d. The list was most recently revised in October 2018.
2018 Revised CT Invasive Plant List sorted by scientific name (PDF)
(P) indicates Potentially Invasive (all others are considered Invasive in Connecticut)
“Prohibited by Statute?” column indicates prohibited status: Yes=prohibited from importation, movement, sale, purchase, transplanting, cultivation and distribution under CT General Statutes §22a-381d; N/A=not prohibited
Additional control information on these plants and other invasive plants is available here.
|
SPECIES (SCIENTIFIC NAME) |
SPECIES(COMMON NAME) | GROWTH FORM OR HABIT | PROHIBITED BY STATUTE? | FACTSHEETS* | PHOTOS | GO BOTANY LINK | ID SHEETS |
| Acer ginnala |
Amur maple (P) | Tree | N/A | PA DCNR; NRCS | Invasive.org | Go Botany | |
| Acer platanoides | Norway maple | Tree | N/A | CIPWG; PA DCNR | Invasive.org | Go Botany | NRCS-2 |
| Acer pseudoplatanus | Sycamore maple (P) | Tree | Yes | PA DCNR; | Invasive.org | Go Botany | |
| Aegopodium podagraria | Goutweed/Bishops Weed | Herbaceous | Yes | Invasive.org | Go Botany | NRCS-1 | |
| Ailanthus altissima | Tree of heaven | Tree | Yes | PA DCNR; | Invasive.org | Go Botany | NRCS-1 |
| Alliaria petiolata | Garlic mustard | Herbaceous | Yes | Maine; PA DCNR; TNC; UNH | Invasive.org | Go Botany | NRCS-2 |
| Amorpha fruticosa | False indigo (P) | Shrub | Yes | NRCS | Invasive.org | Go Botany | |
| Ampelopsis brevipedunculata | Porcelainberry | Woody Vine | N/A | Maine; PA DCNR; | Invasive.org | Go Botany | NRCS-2 |
| Artemisia vulgaris | Mugwort | Herbaceous | N/A | CWMA | Invasive.org | Go Botany | NRCS-2 |
| Arthraxon hispidus | Hairy jointgrass (P) | Grass or Grass-like | Yes | PA DCNR | Invasive.org | Go Botany | |
| Bassia scoparia | Common kochia (P) | Herbaceous | Yes | NRCS | Invasive.org | Go Botany | |
| Berberis thunbergii | Japanese barberry | Shrub | N/A | DEEP; Maine; PA DCNR; | Invasive.org | Go Botany | NRCS-1; NRCS-2 |
| Berberis vulgaris | Common barberry | Shrub | Yes | NRCS; PA DCNR | Invasive.org | Go Botany | |
| Bromus tectorum | Drooping brome-grass (P) | Grass or Grass-like | Yes | NRCS; PA DCNR | Invasive.org | Go Botany | |
| Butomus umbellatus | Flowering rush (P) | Aquatic & Wetland | Yes | CAES; MIPN; Montana; | Invasive.org | Go Botany | |
| Cabomba caroliniana | Fanwort | Aquatic & Wetland | Yes | CAES; Maine; PA DCNR; RI DEM | Invasive.org | Go Botany | |
| Callitriche stagnalis | Pond water-starwort (P) | Aquatic & Wetland | Yes | CAES | Invasive.org | Go Botany | |
| Cardamine impatiens | Narrowleaf bittercress | Herbaceous | Yes | PA DCNR | Invasive.org | Go Botany | NRCS-2 |
| Carex kobomugi | Japanese sedge (P) | Grass or Grass-like | Yes | Invasive.org | Go Botany | NRCS-2 | |
| Celastrus orbiculatus | Oriental bittersweet | Woody Vine | Yes | Maine; NRCS; PA DCNR | Invasive.org | Go Botany | NRCS-1 |
| Centaurea stoebe | Spotted knapweed | Herbaceous | Yes | NRCS; PA DCNR; | Invasive.org | Go Botany | NRCS-1 |
| Cirsium arvense | Canada thistle (P) | Herbaceous | Yes | PA DCNR; | Invasive.org | Go Botany | NRCS-2 |
| Cynanchum louiseae | Black swallow-wort | Herbaceous | Yes | Maine; PA DCNR; | Invasive.org | Go Botany | NRCS-1 |
| Cynanchum rossicum | Pale swallow-wort | Herbaceous | Yes | PA DCNR; USFS | Invasive.org | Go Botany | NRCS-1 |
| Datura stramonium | Jimsonweed (P) | Herbaceous | Yes | PA DCNR | Invasive.org | Go Botany | |
| Egeria densa | Brazilian water-weed (P) | Aquatic & Wetland | Yes | CAES; Maine; PA DCNR; RI DEM | Invasive.org Photos | Go Botany | NRCS-1 |
| Eichhornia crassipes | Common water-hyacinth (P) | Aquatic & Wetland | N/A | CAES; RI DEM; UF | Invasive.org | Go Botany | NRCS-2 |
| Elaeagnus angustifolia | Russian olive (P) | Shrub | Yes | Maine; PA DCNR; | Invasive.org | Go Botany | NRCS-1; NRCS-2 |
| Elaeagnus umbellata | Autumn olive | Shrub | Yes | CIPWG; DEEP; Maine; NRCS; PA DCNR | Invasive.org | Go Botany | NRCS-1; NRCS-2 |
| Elsholtzia ciliata | Crested late-summer mint (P) | Herbaceous | Yes | IPANE | Invasive.org | Go Botany | |
| Euonymus alatus | Winged euonymus | Shrub | N/A | CIPWG; NRCS; PA DCNR | Invasive.org | Go Botany | NRCS-1 |
| Euphorbia cyparissias | Cypress spurge (P) | Herbaceous | Yes | IPANE; | Invasive.org | Go Botany | NRCS-1 |
| Euphorbia esula | Leafy spurge | Herbaceous | Yes | NRCS; | Invasive.org | Go Botany | |
| Frangula alnus | Glossy Buckthorn | Shrub | N/A | DEEP; Maine; NRCS; PA DCNR; | Invasive.org | Go Botany | NRCS-1 |
| Froelichia gracilis | Slender snake cotton | Herbaceous | Yes | IPANE | Invasive.org | Go Botany | |
| Glechoma hederacea | Ground ivy (P) | Herbaceous | Yes | NRCS | Invasive.org | Go Botany | |
| Glyceria maxima | Reed mannagrass (P) | Grass or Grass-like | Yes | IPANE | Invasive.org | Go Botany | |
| Heracleum mantegazzianum | Giant hogweed (P) | Herbaceous | Yes | CIPWG; PA DCNR; | Invasive.org Photos | Go Botany | |
| Hesperis matronalis | Dame’s rocket | Herbaceous | Yes | PA DCNR; | Invasive.org | Go Botany | NRCS-1 |
| Humulus japonicus | Japanese hops (P) | Herbaceous | Yes | PA DCNR; | Invasive.org | Go Botany | NRCS-2 |
| Hydrilla verticillata | Hydrilla | Aquatic & Wetland | Yes | CAES; Maine; NRCS | Invasive.org Photos | Go Botany | NRCS-2 |
| Impatiens glandulifera | Ornamental jewelweed (P) | Herbaceous | Yes | IPANE; WA NWCB | Invasive.org | Go Botany | NRCS-2 |
| Iris pseudacorus | Yellow iris | Aquatic & Wetland | Yes | CAES; CIPWG; NRCS; PA DCNR | Invasive.org | Go Botany | NRCS-2 |
| Lepidium latifolium | Perennial pepperweed | Herbaceous | Yes | PCA; WA NWCB | Invasive.org | Go Botany | |
| Ligustrum obtusifolium | Border privet (P) | Shrub | Yes | PA DCNR; | Invasive.org | Go Botany | NRCS-2 |
| Ligustrum ovalifolium | California privet (P) | Shrub | N/A | Invasive.org | Go Botany | NRCS-2 | |
| Ligustrum vulgare | European privet (P) | Shrub | N/A | PA DCNR; | Invasive.org | Go Botany | NRCS-2 |
| Lonicera japonica | Japanese honeysuckle | Woody Vine | Yes | DEEP; Maine; PA DCNR; USFS | Invasive.org | Go Botany | NRCS-1; NRCS-2 |
| Lonicera maackii | Amur honeysuckle | Shrub | Yes | PA DCNR; PCA; TNC; USFS | Invasive.org | Go Botany | NRCS-2 |
| Lonicera morrowii | Morrow’s honeysuckle | Shrub | Yes | Maine; NRCS; PA DCNR; TNC; USFS | Invasive.org | Go Botany | NRCS-2 |
| Lonicera tatarica | Tatarian honeysuckle (P) | Shrub | Yes | Maine; NRCS; PA DCNR; TNC; | Invasive.org | Go Botany | NRCS-2 |
| Lonicera x bella | Belle honeysuckle | Shrub | Yes | Maine; PA DCNR; TNC; Wisconsin | Invasive.org | NRCS-2 | |
| Lonicera xylosteum | Dwarf honeysuckle (P) | Shrub | Yes | TNC | Invasive.org | Go Botany | NRCS-2 |
| Lychnis flos-cuculi | Ragged robin (P) | Herbaceous | Yes | IPANE | Invasive.org | Go Botany | |
| Lysimachia nummularia | Moneywort (P) | Herbaceous | N/A | PA DCNR; USFS | Invasive.org | Go Botany | |
| Lysimachia vulgaris | Garden loosestrife (P) | Herbaceous | Yes | IPANE; UC-Davis; WA NWCB | Invasive.org | Go Botany | |
| Lythrum salicaria | Purple loosestrife | Aquatic & Wetland | Yes | CAES; Maine; NRCS; PA DCNR; TNC; UConn | Invasive.org | Go Botany | NRCS-1; NRCS-2 |
| Marsilea quadrifolia | European waterclover (P) | Aquatic & Wetland | Yes | CAES; IPANE | Invasive.org | Go Botany | |
| Microstegium vimineum | Japanese stilt grass | Grass or Grass-like | Yes | Maine; PA DCNR; TNC; | Invasive.org | Go Botany | NRCS-1; NRCS-2 |
| Miscanthus sinensis | Eulalia (P) | Grass or Grass-like | N/A | IPANE; PA DCNR; USFS | Invasive.org | Go Botany | |
| Myosotis scorpioides | Forget-me-not | Aquatic & Wetland | Yes | CAES; IPANE | Invasive.org | Go Botany | NRCS-2 |
| Myriophyllum aquaticum | Parrotfeather (P) | Aquatic & Wetland | Yes | CAES; PA DCNR; RI DEM; WA NWCB | Invasive.org | Go Botany | NRCS-1; NRCS-2 |
| Myriophyllum heterophyllum | Variable-leaf watermilfoil | Aquatic & Wetland | Yes | CAES; RI DEM; WA NWCB | Invasive.org | Go Botany | NRCS-1 |
| Myriophyllum spicatum | Eurasian watermilfoil | Aquatic & Wetland | Yes | CAES; Maine; NRCS; PA DCNR; RI DEM; WA NWCB | Invasive.org | Go Botany | NRCS-1 |
| Najas minor | Brittle water-nymph (P) | Aquatic & Wetland | Yes | CAES; IPANE; RI DEM | Invasive.org | Go Botany | |
| Nasturtium microphyllum | Onerow yellowcress (P) | Aquatic & Wetland | Yes | CAES; IPANE | Invasive.org | Go Botany | |
| Nasturtium officinale | Watercress (P) | Aquatic & Wetland | Yes | CAES; WA NWCB | Invasive.org | Go Botany | |
| Nelumbo lutea | American water lotus (P) | Aquatic & Wetland | Yes | CAES; RI DEM | Invasive.org | Go Botany | NRCS-2 |
| Nymphoides peltata | Yellow floating heart (P) | Aquatic & Wetland | Yes | CAES; IPANE; RI DEM; WA NWCB | Invasive.org | Go Botany | |
| Onopordum acanthium | Scotch thistle (P) | Herbaceous | Yes | IPANE; WA NWCB | Invasive.org | Go Botany | |
| Ornithogalum umbellatum | Star-of-Bethlehem (P) | Herbaceous | N/A | IPANE; PA DCNR; | Invasive.org | Go Botany | |
| Paulownia tomentosa | Princess tree (P) | Tree | Yes | PA DCNR; | Invasive.org | Go Botany | |
| Phalaris arundinacea | Reed canary grass | Grass or Grass-like | N/A | NRCS; PA DCNR; WA NWCB | Invasive.org | Go Botany | NRCS-2 |
| Phragmites australis | Common reed | Grass or Grass-like | Yes | Maine; NRCS; PA DCNR; TNC; WA NWCB | Invasive.org | Go Botany | NRCS-1; NRCS-2 |
| Pistia stratiotes | Water lettuce (P) | Aquatic & Wetland | N/A | CAES; IPANE | Invasive.org | ||
| Poa compressa | Canada bluegrass (P) | Grass or Grass-like | Yes | IPANE; NRCS | Invasive.org | Go Botany | |
| Polygonum caespitosum | Bristled knotweed | Herbaceous | Yes | IPANE | Invasive.org | ||
| Polygonum cuspidatum | Japanese knotweed | Herbaceous | Yes | DEEP; Maine; MI DNR; NRCS; PA DCNR; PCA; TNC | Invasive.org | NRCS-2 | |
| Polygonum perfoliatum | Mile-a-minute vine | Herbaceous | Yes | CIPWG; Maine; NRCS; UConn; | Invasive.org Photos | Go Botany | NRCS-1; NRCS-2 |
| Polygonum sachalinense | Giant knotweed (P) | Herbaceous | Yes | PA DCNR; WA NWCB | Invasive.org | Go Botany | |
| Populus alba | White poplar (P) | Tree | Yes | IPANE; | Invasive.org | Go Botany | |
| Potamogeton crispus | Curly-leafed pondweed | Aquatic & Wetland | Yes | CAES; NRCS; PA DCNR; RI DEM; WA NWCB | Invasive.org | Go Botany | NRCS-1 |
| Pueraria montana | Kudzu (P) | Woody Vine | Yes | PA DCNR; USFS; WA NWCB | Invasive.org Photos | Go Botany | NRCS-2 |
| Ranunculus ficaria | Fig buttercup | Herbaceous | Yes | PCA | Invasive.org | NRCS-2 | |
| Rhamnus cathartica | Common buckthorn | Shrub | Yes | Maine; NRCS; PA DCNR; | Invasive.org | Go Botany | NRCS-1 |
| Robinia pseudoacacia | Black locust | Tree | N/A | NRCS; | Invasive.org | Go Botany | NRCS-1 |
| Rosa multiflora | Multiflora rose | Shrub | Yes | DEEP; Maine; NRCS; PA DCNR; TNC | Invasive.org | Go Botany | NRCS-1NRCS-2 |
| Rosa rugosa | Rugosa rose (P) | Shrub | N/A | NRCS | Invasive.org | Go Botany | |
| Rubus phoenicolasius | Wineberry | Shrub | Yes | PA DCNR; USFS | Invasive.org | Go Botany | |
| Rumex acetosella | Sheep sorrel (P) | Herbaceous | Yes | USFS | Invasive.org | Go Botany | |
| Salvinia molesta | Giant salvinia (P) | Aquatic & Wetland | Yes | CAES; IPANE; | Invasive.org | Go Botany | |
| Senecio jacobaea | Tansy ragwort (P) | Herbaceous | Yes | IPANE; WA NWCB | Invasive.org | Go Botany | |
| Silphium perfoliatum | Cup plant (P) | Herbaceous | Yes | NRCS | Invasive.org | Go Botany | |
| Solanum dulcamara | Bittersweet nightshade (P) | Herbaceous | Yes | IPANE; USFS | Invasive.org | Go Botany | |
| Trapa natans | Water chestnut | Aquatic & Wetland | Yes | CAES; Maine; PA DCNR; PCA; RI DEM | Invasive.org | Go Botany | NRCS-1; NRCS-2 |
| Tussilago farfara | Coltsfoot | Herbaceous | Yes | IPANE; USFS; WA NWCB | Invasive.org | Go Botany | |
| Valeriana officinalis | Garden heliotrope (P) | Herbaceous | Yes | IPANE; | Invasive.org | Go Botany |
*CAES= Connecticut Agricultural Experiment Station CIPWG= Connecticut Invasive Plant Working Group DEEP= Connecticut Department of Energy and Environmental Protection IPANE= Invasive Plant Atlas of New England Maine= University of Maine Cooperative Extension MIPN= Midwest Invasive Plant Network Montana= Montana State University Extension NRCS= Natural Resource Conservatioice, United States Department of Agriculture PCA= Plant Conservation Alliance, National Park Service PA DCNR= Pennsylvania Department of Conservation and Natural Resources RI DEM= RIsland Department of Environmental Management TNC= The Nature Conservancy UC-Davis= University of California-Davis, Cooperative Extension & Agricultural Experiment Station USFS= US Forest Service, United States Department of Agriculture UF= University of Fla Extension UNH= University of New Hampshire Extension WA NWCB= Washington State Noxious Weed Control Board