Acroptilon repens, Russian Knapweed


Invasive Species: Acroptilon repens, Russian Knapweed

Russian knapweed is an invasive perennial forb that can grow to 3 ft. (1 m) in height. Stems originate from a basal rosette of leaves. The rosette leaves can be unlobed to very …

Carduus tenuiflorus, Slenderflower Thistle


Invasive Species: Carduus tenuiflorus, Slenderflower Thistle

Slenderflower thistle is an herbaceous winter annual or biennial plant that invades disturbed areas. The most serious infestations occur in the Pacific coastal states, but slenderflower thistle also occurs sporadically in the eastern …

Solanum dulcamara, Bittersweet Nightshade


Invasive Species: Solanum dulcamara, Bittersweet Nightshade

Bittersweet nightshade is an invasive perennial plant native to Eurasia. Plants can reach up to 6.6 ft. (2 m) tall, either erect or clambering. Leaves are petiolate, alternate, three-lobed (upper part of the …

Vinca major, Bigleaf Periwinkle


Invasive Species: Vinca major, Bigleaf Periwinkle

Bigleaf periwinkle is an invasive evergreen to semi-evergreen trailing vine that reaches to over 6.6 ft. (2 m) in length. The stems are stout, somewhat woody, and green. The opposite, glossy leaves are …

Cardaria draba, Hoary Cress


Invasive Species: Cardaria draba, Hoary Cress

Hoary cress, or whitetop, is an invasive perennial forb in the mustard family that can grow up to 2 ft. (0.6 m) tall. The leaves are soft, gray-green, 1.5 to 3 in. (3.7 …

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, …