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Johnsongrass Resources

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Washington State Noxious Weed Control Board.
University of Georgia. Center for Invasive Species and Ecosystem Health.
Provides state, county, point and GIS data. Maps can be downloaded and shared.
California Department of Food and Agriculture.
See also: Included on California's noxious weed list; see Encycloweedia: Program Details for additional resources

USDA. APHIS. PPQ. Center for Plant Health Science and Technology; California Department of Food and Agriculture.

Missouri Department of Conservation.
See also: Problem Plant Control (scroll to Invasive Plants section) for more information to help you identify and control most common invasive plants in Missouri
USDA. FS. Rocky Mountain Research Station. Fire Sciences Laboratory.
IUCN. Species Survival Commission. Invasive Species Specialist Group.
University of Georgia. Center for Invasive Species and Ecosystem Health.
Pennsylvania Department of Conservation and Natural Resources.
See also: Invasive Plant Fact Sheets for plant species (trees, shrubs, vines, herbs and aquatic plants) that have impacted the state's natural lands
North Carolina Department of Agriculture and Consumer Services. Forest Service.
See also: Forest Health Publications for more Invasive Species Leaflets
North Carolina State University. Cooperative Extension. Going Native: Urban Landscaping for Wildlife with Native Plants.
University of Georgia. Center for Invasive Species and Ecosystem Health.

Wisconsin Department of Natural Resources.

University of Delaware. Cooperative Extension.
See also: Weed Management Guides for more species
Colorado Department of Agriculture. Conservation Services Division. Noxious Weed Program.
Ohio State University. Ohio Agricultural Research and Development Center.
USDA. FS. Institute of Pacific Islands Forestry.
USDA. NRCS. National Plant Data Center.