- Verbascum thapsus is a biennial forb native to Eurasia and Africa. Plants are unbranched and can grow to more than 6.6 ft. (2 m) tall.
- First year plants develop as a basal rosette of felt-like leaves. Basal leaves are 4-12 in. (10.2-30.5 cm) long, 1-5 in. (2.5-12.7 cm) wide and covered with woolly hairs. Cauline (stem) leaves are decurrently alternate and decrease in size towards the apex.
- The plant bolts in the second year. Flowering occurs in June to August, when five-petaled, yellow flowers develop at the apex of the shoot. Plants die after flowering.
- The fruit is a ovoid capsule that splits, releasing 100,000 to 180,000 seeds from the parent plant, that germinate in water.
- Ecological Threat
- Once established it grows quickly to form a dense ground cover. It can overtake and displace native species. At the high densities, it appears to prevent establishment of native herbs and grasses following fires or other disturbances. Verbascum thapsus occurs in areas with an average annual precipitation of 20-60 in. (0.5-1.5 m) and a 140-day growing season. It prefers well-drained soils with pH 6.5 to 7.8. It prefers dry sandy soils but can grow in chalk and limestone. It can be found in neglected meadows, forest openings, pastures, fence rows, roadsides, and industrial areas.
- Weeds Gone Wild: Alien Plant Invaders of Natural Areas - Plant Conservation Alliance
- Element Stewardship Abstract - The Nature Conservancy
- Weed of the Week - USDA Forest Service
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EDDMapS Distribution - This map is incomplete and is based only on current site and county level reports made by experts, herbaria, and literature. For more information, visit www.eddmaps.org
State Invasive List - This map identifies those states that list this species on their invasive species list. For more information, visit Invasive.org
Invasive Listing Sources
- California Invasive Plant Council
- Colorado Noxious Weeds
- Connecticut Department of Environmental Protection
- Eric Ulaszek, U.S. Forest Service, Midewin National Tallgrass Prairie, Illinois
- Faith Campbell, 1998
- Georgia Exotic Pest Plant Council - Category 4
- Great Lakes Early Detection Network
- Hoffman, R. & K. Kearns, Eds. 1997. Wisconsin manual of control recommendations for ecologically invasive plants. Wisconsin Dept. Natural Resources, Bureau of Endangered Resources. Madison, Wisconsin. 102pp.
- Illinois Invasive Plant List
- Jil M. Swearingen, Survey of invasive plants occurring on National Park Service lands, 2000-2007
- John Randall, The Nature Conservancy, Survey of TNC Preserves, 1995.
- Mid-Atlantic Exotic Pest Plant Council, 2005
- Missouri Department of Conservation,
- Native Plant Society of Oregon, 2008
- New Jersey Department of Agriculture, Division of Plant Industry, 2004
- Nonnative Invasive Species in Southern Forest and Grassland Ecosystems
- Pacific Northwest Exotic Pest Plant Council, 1998
- Pennypack Ecological Restoration Trust, Pennsylvania.
- South Dakota Noxious Weeds
- Tennessee Exotic Pest Plant Council
- University of Hawaii, Botany Department, Hawaiian Alien Plant Studies, 1998
- WeedUS - Database of Plants Invading Natural Areas in the United States
Other System LinksPlants: VETH
NPDN Pest: PEUAOBD
NPDN Host: 31550
|Common Name Reference:|| USDA, NRCS. 2010. The PLANTS Database. National Plant Data Center, Baton Rouge, LA, USA.|
|Scientific Name Reference:||USDA, NRCS. 2010. The PLANTS Database. National Plant Data Center, Baton Rouge, LA, USA.|