Porcelain Berry
Porcelain berry is a perennial, deciduous vine that can grow up to 20 feet long. It produces small greenish-yellow flowers that develop into hard berries in various shades that mature to a bright blue.
Japanese Angelica Tree
The Japanese angelica tree is a deciduous shrub or tree that can grow up to 40’ in height. The tree is multi-stemmed, and the bark is covered in sharp thorns.
Tree of Heaven
Tree of heaven thrives in disturbed habitats but is highly intolerant of shade. Infestations are most commonly found beneath powerlines and along rights of way, as well as in riparian zones, forest edges and openings.
Glossy Buckthorn
Glossy buckthorn is a deciduous shrub, or small tree, that can grow up to 30 ft in height. Bark is dark gray to brown with white lenticels.
Black Locust
Black locusts threaten prairies, savannahs and upland forests. They have an extensive root system that allows them to reproduce clonally, sprouting many clones in one area. As they grow, they’ll form islands of dense canopy which shade out any plants below them.
Norway Maple
Norway maples produce large numbers of seeds which can be widely dispersed due to their winged samaras.
Multi-flora Rose
Multi-flora rose is extremely prolific, producing large amounts of seeds which are dispersed by birds. These seeds can remain viable for 20 years
Border Privet
Border privet is a deciduous shrub that may grow to be 20 ft. tall. It forms dense thickets, shading out native plants. It also displaces native shrubs and seedlings in regenerating forests.
Cattails – Narrowleaf and Hybrid
The dense rhizome mats and thick layer of leaf litter that cattails produce, exclude other plants from growing within cattail stands, making them a threat to biodiversity.
Japanese Barberry
Japanese barberry is a deciduous shrubs that can grow 8 ft. tall. It has grooved stems with single or paired thorns in the nodes.
Dames Rocket
Dames rocket is a flowering biennial that was introduced in North America in the 1600s. During its first year, it grows as a basal rosette. In its second year, its flowering stem grows up to 4 ft. tall. Dames rocket has alternate, lance-shaped leaves with serrate margins.
Common Daylily
Daylilies produce clusters of 5-9 large, showy orange flowers. Each individual flower exists only for one day.
Spotted Knapweed
Spotted knapweed is an herbaceous biennial, although it may live for up to nine years. In its first year it grows in a basal rosette with 6-8” leaves. In every year after that, it can grow up to 3 ft. tall with flowers growing at the ends of its many branching stems.
Chinese Silver Grass
Chinese silver grass rapidly spreads in areas that have been disturbed, such as roadsides. It is considered a wildfire hazard because it produces large amounts of highly flammable, dry plant material.
Reed Canarygrass
Reed canarygrass can reach 5 ft. in height. Its leaves are hairless, reaching up to 10” long and 1⁄4″ to 1⁄3″ wide. This grass has an extensive root system and spreads primarily through rhizomes, but also produces a high number of seeds.
