Identification -


Common / Scientific Names (Top Offenders)


Autumn olive Elaeagnus umbellata Thunb. S

Growth Form:

A = Aquatic & Wetland;

G = Grass & Grass-like;

H = Herbaceous;

S = Shrub;

T = Tree;

V = Woody Vine


Common Name Symbols:
(P) indicates Potentially Invasive (all other plants listed are considered Invasive in Connecticut)

* denotes that the species, although shown by scientific evaluation to be invasive, has cultivars that have not been evaluated for invasive characteristics. Further research may determine whether or not individual cultivars are potentially invasive. Cultivars are commercially available selections of a plant species that have been bred or selected for predictable, desirable attributes of horticultural value such as form (dwarf or weeping forms), foliage (variegated or colorful leaves), or flowering attributes (enhanced flower color or size).


For a full list of invasives, click here.

Coltsfoot Tussilago farfara L. H
Common barberry Berberis vulgaris L. S
Common buckthorn Rhamnus cathartica L. S
Common reed Phragmites australis (Cav.) Trin. G
Crispy-leaved pondweed Potamogeton crispus L. A
Dame's rocket Hesperis matronalis L. H
Eurasian watermilfoil Myriophyllum spicatum L. A
Fanwort Cabomba caroliniana A. Gray A
Fig buttercup Ranunculus ficaria L. H
Forget-me-not Myosotis scorpioides L. A
Garlic mustard Alliaria petiolata H
Glossy buckthorn Frangula alnus Mill. S
Goutweed Aegopodium podagraria L. H
Hydrilla Hydrilla verticillata (L.f.) Royle A
Japanese barberry * Berberis thunbergii DC. S
Japanese knotweed Polygonum cuspidatum H
Japanese stilt grass Microstegium vimineum G
Leafy spurge Euphorbia esula L. H
Mile-a-minute vine Persicaria perfoliata H
Multiflora rose Rosa multiflora Thunb. S
Norway maple * Acer platanoides L. T
Oriental bittersweet Celastrus orbiculatus Thunb. V
Pale swallow-wort Cynanchum rossicum (Kleo.) Borhidi H
Purple loosestrife Lythrum salicaria L. A
Russian olive (P) Elaeagnus angustifolia L. S
Spotted knapweed Centaurea biebersteinii DC. H
Tree of heaven Ailanthus altissima (Mill.) Swingle T
Variable-leaf watermilfoil Myriophyllum heterophyllum A
Water chestnut Trapa natans L. A
Winged euonymus * Euonymus alatus (Thunb.) Sieb. S
Yellow iris Iris pseudacorus L. A