Invasive Plants in Northern Virginia: Japanese Knotwood
Japanese knotweed is a particularly aggressive buckwheat family member found throughout the Mid-Atlantic region. The plant was introduced to the United States from Japan in the early 1800s as an ornamental and erosion-control plant and has been considered as invasive, especially in riparian areas, since it escaped cultivation in the 1930s.
Invasive Plants in Northern Virginia: Canada Thistle
Cirsium arvense, (Canada thistle), a native of southeastern Europe and the Mediterranean, was brought to North America in early 1700s, probably as a contaminant of crop seed. By the end of the century is was already recognized as a noxious weed in crops, and it is now recognized as invasive in open natural areas, such as fields, meadows, wet prairies, and even inhospitable sand dunes, through most of the United States.
Invasive Plants in Northern Virginia: Japanese Stiltgrass
One of more damaging invasive species in the Mid-Atlantic region, Microstegium vimineum, (Japanese stiltgrass) threatens wooded areas and is increasingly found on farms and in residential areas where it can invade lawns, landscape beds, and vegetable gardens.
Invasive Plants in Northern Virginia: Multiflora Rose
Another “top ten” invasive plant in Arlington County is multiflora rose (Rosa multiflora), a perennial shrub introduced to the United States from Asia in the 1860s as rootstock for ornamental roses.
Invasive Plants in Northern Virginia: Ground Ivy
Glechoma hederacea (ground ivy), also known as creeping Charlie and gill-over-the-ground, is listed as invasive in both Arlington County and the City of Alexandria and has been reported in national parks in Maryland, Virginia, Washington, D. C., West Virginia, and Tennessee.