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 re-printed in October 2018.
2018 Re-Printed 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 | Invasive.org | Go Botany | |
| Acer platanoides | Norway maple | Tree | N/A | UMD | Invasive.org | Go Botany | NRCS-2 |
| Acer pseudoplatanus | Sycamore maple (P) | Tree | Yes | Morton Arb | Invasive.org | Go Botany | |
| Aegopodium podagraria | Goutweed/Bishops Weed | Herbaceous | Yes | Invasive.org | Invasive.org | Go Botany | NRCS-1 |
| Ailanthus altissima | Tree of heaven | Tree | Yes | UConn IPM | Invasive.org | Go Botany | NRCS-1 |
| Alliaria petiolata | Garlic mustard | Herbaceous | Yes | UConn IPM Maine | Invasive.org | Go Botany | NRCS-2 |
| Amorpha fruticosa | False indigo (P) | Shrub | Yes | Invasive.org | Go Botany | ||
| Ampelopsis brevipedunculata | Porcelainberry | Woody Vine | N/A | Invasive.org | Go Botany | NRCS-2 | |
| Artemisia vulgaris | Mugwort | Herbaceous | N/A | UConn/CIPWG | Invasive.org | Go Botany | NRCS-2 |
| Arthraxon hispidus | Hairy jointgrass (P) | Grass or Grass-like | Yes | Invasive.org | Invasive.org | Go Botany | |
| Bassia scoparia | Common kochia (P) | Herbaceous | Yes | USDA | Invasive.org | Go Botany | |
| Berberis thunbergii | Japanese barberry | Shrub | N/A | UConn IPM DEEP Maine | Invasive.org | Go Botany | NRCS-1; NRCS-2 |
| Berberis vulgaris | Common barberry | Shrub | Yes | MDA State | Invasive.org | Go Botany | |
| Bromus tectorum | Drooping brome-grass (P) | Grass or Grass-like | Yes | NRCS | Invasive.org | Go Botany | |
| Butomus umbellatus | Flowering rush (P) | Aquatic & Wetland | Yes | CAES | Invasive.org | Go Botany | |
| Cabomba caroliniana | Fanwort | Aquatic & Wetland | Yes | CAES | 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 | PCA | Invasive.org | Go Botany | NRCS-2 |
| Celastrus orbiculatus | Asiatic bittersweet | Woody Vine | Yes | UConn IPM PSU | Invasive.org | Go Botany | NRCS-1 |
| Centaurea stoebe | Spotted knapweed | Herbaceous | Yes | USDA | 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 | UConn IPM | Invasive.org | Go Botany | NRCS-1 |
| Cynanchum rossicum | Pale swallow-wort | Herbaceous | Yes | UConn IPM | Invasive.org | Go Botany | NRCS-1 |
| Datura stramonium | Jimsonweed (P) | Herbaceous | Yes | USU EXT | Invasive.org | Go Botany | |
| Egeria densa | Brazilian water-weed (P) | Aquatic & Wetland | Yes | CAES | Invasive.org Photos | Go Botany | NRCS-1 |
| Eichhornia crassipes | Common water-hyacinth (P) | Aquatic & Wetland | N/A | CAES | Invasive.org | Go Botany | NRCS-2 |
| Elaeagnus angustifolia | Russian olive (P) | Shrub | Yes | Maine | Invasive.org | Go Botany | NRCS-1 |
| Elaeagnus umbellata | Autumn olive | Shrub | Yes | CIPWG | Invasive.org | Go Botany | NRCS-1 |
| Elsholtzia ciliata | Crested late-summer mint (P) | Herbaceous | Yes | IPANE | Invasive.org | Go Botany | |
| Euonymus alatus | Winged euonymus | Shrub | N/A | UConn IPM | 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 | USDA | Invasive.org | Go Botany | |
| Frangula alnus | Glossy Buckthorn | Shrub | N/A | DEEP | 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 | USDA | Invasive.org | Go Botany | |
| Glyceria maxima | Reed mannagrass (P) | Grass or Grass-like | Yes | USGS | Invasive.org | Go Botany | |
| Heracleum mantegazzianum | Giant hogweed (P) | Herbaceous | Yes | CIPWG | Invasive.org Photos | Go Botany | |
| Hesperis matronalis | Dame’s rocket | Herbaceous | Yes | OSU | 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 | Invasive.org Photos | Go Botany | NRCS-2 |
| Impatiens glandulifera | Ornamental jewelweed (P) | Herbaceous | Yes | EDD Maps | Invasive.org | Go Botany | NRCS-2 |
| Iris pseudacorus | Yellow iris | Aquatic & Wetland | Yes | CAES | Invasive.org | Go Botany | NRCS-2 |
| Lepidium latifolium | Perennial pepperweed | Herbaceous | Yes | EDD Maps | 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 | EDD Maps | Invasive.org | 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 | Invasive.org | Go Botany | NRCS-1 |
| Lonicera maackii | Amur honeysuckle | Shrub | Yes | PA DCNR | Invasive.org | Go Botany | NRCS-2 |
| Lonicera morrowii | Morrow’s honeysuckle | Shrub | Yes | Maine | Invasive.org | Go Botany | NRCS-2 |
| Lonicera tatarica | Tatarian honeysuckle (P) | Shrub | Yes | Maine | Invasive.org | Go Botany | NRCS-2 |
| Lonicera x bella | Belle honeysuckle | Shrub | Yes | Maine | 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 | Invasive.org | Go Botany | |
| Lysimachia vulgaris | Garden loosestrife (P) | Herbaceous | Yes | IPANE | Invasive.org | Go Botany | |
| Lythrum salicaria | Purple loosestrife | Aquatic & Wetland | Yes | UConn | Invasive.org | Go Botany | NRCS-1 |
| Marsilea quadrifolia | European waterclover (P) | Aquatic & Wetland | Yes | CAES | Invasive.org | Go Botany | |
| Microstegium vimineum | Japanese stiltgrass | Grass or Grass-like | Yes | UConn IPM | Invasive.org | Go Botany | NRCS-1 |
| Miscanthus sinensis | Eulalia (P) | Grass or Grass-like | N/A | IPANE | Invasive.org | Go Botany | |
| Myosotis scorpioides | Forget-me-not | Aquatic & Wetland | Yes | CAES | Invasive.org | Go Botany | NRCS-2 |
| Myriophyllum aquaticum | Parrotfeather (P) | Aquatic & Wetland | Yes | CAES | Invasive.org | Go Botany | NRCS-1 |
| Myriophyllum heterophyllum | Variable-leaf watermilfoil | Aquatic & Wetland | Yes | CAES | Invasive.org | Go Botany | NRCS-1 |
| Myriophyllum spicatum | Eurasian watermilfoil | Aquatic & Wetland | Yes | CAES | Invasive.org | Go Botany | NRCS-1 |
| Najas minor | Brittle water-nymph (P) | Aquatic & Wetland | Yes | CAES | Invasive.org | Go Botany | |
| Nasturtium microphyllum | Onerow yellowcress (P) | Aquatic & Wetland | Yes | CAES | Invasive.org | Go Botany | |
| Nasturtium officinale | Watercress (P) | Aquatic & Wetland | Yes | CAES | Invasive.org | Go Botany | |
| Nelumbo lutea | American water lotus (P) | Aquatic & Wetland | Yes | CAES | Invasive.org | Go Botany | NRCS-2 |
| Nymphoides peltata | Yellow floating heart (P) | Aquatic & Wetland | Yes | CAES | Invasive.org | Go Botany | |
| Onopordum acanthium | Scotch thistle (P) | Herbaceous | Yes | IPANE | Invasive.org | Go Botany | |
| Ornithogalum umbellatum | Star-of-Bethlehem (P) | Herbaceous | N/A | IPANE | 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 | DNR MN | Invasive.org | Go Botany | NRCS-2 |
| Phragmites australis | Common reed | Grass or Grass-like | Yes | UConn IPM PA DCNR | Invasive.org | Go Botany | NRCS-1 |
| Pistia stratiotes | Water lettuce (P) | Aquatic & Wetland | N/A | CAES | Invasive.org | ||
| Poa compressa | Canada bluegrass (P) | Grass or Grass-like | Yes | IPANE | Invasive.org | Go Botany | |
| Polygonum caespitosum | Bristled knotweed | Herbaceous | Yes | Invasive.org | |||
| Polygonum cuspidatum | Japanese knotweed | Herbaceous | Yes | DEEP | Invasive.org | NRCS-2 | |
| Polygonum perfoliatum | Mile-a-minute vine | Herbaceous | Yes | UConn IPM | Invasive.org Photos | Go Botany | NRCS-1 |
| Polygonum sachalinense | Giant knotweed (P) | Herbaceous | Yes | PA DCNR | Invasive.org | Go Botany | |
| Populus alba | White poplar (P) | Tree | Yes | MAINE | Invasive.org | Go Botany | |
| Potamogeton crispus | Curly-leafed pondweed | Aquatic & Wetland | Yes | CAES | Invasive.org | Go Botany | NRCS-1 |
| Pueraria montana | Kudzu (P) | Woody Vine | Yes | PA DCNR | 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 | 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 | UConn IPM DEEP | Invasive.org | Go Botany | NRCS-1 |
| Rosa rugosa | Rugosa rose (P) | Shrub | N/A | USDA | Invasive.org | Go Botany | |
| Rubus phoenicolasius | Wineberry | Shrub | Yes | PA DCNR | 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 | Invasive.org | ||
| Senecio jacobaea | Tansy ragwort (P) | Herbaceous | Yes | EDD Maps | Invasive.org | Go Botany | |
| Silphium perfoliatum | Cup plant (P) | Herbaceous | Yes | USDA | Invasive.org | Go Botany | |
| Solanum dulcamara | Bittersweet nightshade (P) | Herbaceous | Yes | IPANE | Invasive.org | Go Botany | |
| Trapa natans | Water chestnut | Aquatic & Wetland | Yes | CAES | Invasive.org | Go Botany | NRCS-1; NRCS-2 |
| Tussilago farfara | Coltsfoot | Herbaceous | Yes | IPANE | 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; EDD Maps = Early Detection and Distribution Mapping System; 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 Conservation; PCA = Plant Conservation Alliance, National Park Service; PA DCNR = Pennsylvania Department of Conservation and Natural Resources; RI DEM = Rhode Island Department of Environmental Management; TNC = The Nature Conservancy; UC-Davis = University of California-Davis, Cooperative Extension & Agricultural Experiment Station; UConn = University of Connecticut; USFS = US Forest Service, United States Department of Agriculture; UF = University of Fla Extension; UNH = University of New Hampshire Extension; USDA = United States Department of Agriculture; WA NWCB = Washington State Noxious Weed Control Board