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INVASIVE SPECIES
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Canada Thistle
Canada Thistle
Cirsium arvense
Canada thistle is a perennial thistle that grows 1.5-5 ft. tall. Canada thistle displaces native vegetation, lowering plant and animal diversity. It also poses an economic threat to farmers and ranchers, reducing crop yields and pasture productivity.
Cattails – Narrowleaf and Hybrid
Cattails – Narrowleaf and Hybrid
Typha angustifolia and T. x glauca
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.
Chinese Silver Grass
Chinese Silver Grass
Miscanthus sinensis
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.
Common Buckthorn
Common Buckthorn
Rhamnus cathartica
Common buckthorn is a deciduous shrub, or small tree, that can grow up to 25 ft in height. Bark is dark gray while inner bark is orange.
Common Periwinkle
Common Periwinkle
Vinca minor
Common periwinkle is an herbaceous, perennial and evergreen groundcover. The leaves are opposite, elliptic in shape and dark green, though some varieties may have variegated coloration. It produces blue-purple flowers with 5 petals that are blunt at the tip and arranged in a spiral or “pinwheel” shape.
Common Teasel
Common Teasel
Dipsacus fullonum
Common teasel, also referred to as Fuller’s teasel, is a biennial or short-lived perennial herbaceous plant that produces a basal rosette of puckering leaves for one or more years, and then sends up a prickly, flowering stem.
Dames Rocket
Dames Rocket
Hesperis matronalis
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.
Elm Zigzag Sawfly
Elm Zigzag Sawfly
Aproceros leucopoda
The elm zigzag sawfly is still in the early detection phase in North America. Please report all sightings of elm zigzag sawfly through iMapInvasives, to help determine the distribution of this species, ahead of any management efforts. Since most elm trees can recover from elm zigzag sawfly defoliation events, control may not be necessary, and research into management options is ongoing.
Emerald Ash Borer
Emerald Ash Borer
Agrilus planipennis
Emerald ash borer has a golden-green body with dark, metallic green wings and a purplish-red abdomen. Adult beetles average 3/8" to 3/4" long and 1/6" wide. EAB emerges in late spring, flying throughout June to August.
English Ivy
English Ivy
Hedera helix
English ivy is an evergreen perennial vine that can grow to reach lengths of 90 feet with proper support or form a dense, trailing mat.