Artemisia absinthium, Absinth Wormwood


Invasive Species: Artemisia absinthium, Absinth Wormwood

Absinth wormwood (absinthium, common wormwood) is an invasive¬†herbaceous perennial plant that can grow up to 5 ft. (1.5 m) tall. It has many branching stems arising from a woody base. Leaves are …

Arctium minus, Lesser Burdock


Invasive Species: Arctium minus, Lesser Burdock

Lesser burdock is a tall (up to 6 ft. [1.8 m]) invasive¬†biennial forb that occurs throughout the United States. First-year plants form large rosettes. A stout flowering stalk is formed in the …

Allium vineale, Wild Garlic


Invasive Species: Allium vineale, Wild Garlic

Wild garlic is an invasive perennial plant that originates from a bulb. Plants range from 11 to 35 in. (30 to 90 cm) in height and have tubular leaves. In May to June, …

Dipsacus fullonum, Common Teasel


Invasive Species: Dipsacus fullonum, Common Teasel

Common teasel is an invasive biennial plant that exists as a basal rosette until flower stems develop. The erect flower stems reach 6 ft. (1.8 m) in height and support spiny flower heads …

Chondrilla juncea, Rush Skeletonweed


Invasive Species: Chondrilla juncea, Rush Skeletonweed

Rush skeletonweed is an invasive perennial forb that can grow up to 4 ft. (1.2 m) tall. Coarse-looking, multiple stems appear leafless due to inconspicuous leaves and arise from a basal rosette of …

Centaurea nigra, Black Knapweed


Invasive Species: Centaurea nigra, Black Knapweed

Black knapweed is an invasive perennial plant that can grow from 1 to 3 ft. (0.3 to 0.9 m) tall. Leaves, near the base, are petiolate, oblanceolate, shallowly dentate, and 2 to 10 …

Centaurea jacea, Brown Knapweed


Invasive Species: Centaurea jacea, Brown Knapweed

Brown knapweed is an invasive perennial plant that grows 1 to 3 ft (0.3 to 0.9 m) tall and invades dry fields, roadsides, and meadows. The basal leaves are oblanceolate to elliptic and …