Ohio State University. Extension.

University of Georgia. Center for Invasive Species and Ecosystem Health.

Provides state, county, point and GIS data. Maps can be downloaded and shared.

Alberta Invasive Species Council (Canada).

See also: Fact Sheets for more information about individual invasive species, including those listed as "Prohibited Noxious" and "Noxious" under the Alberta Weed Control Act

Missouri Department of Conservation.

See also: Invasive and 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.

Google.

Pennsylvania State University. Cooperative Extension.

Clemson University.

South Carolina will become only the second state in the United States to ban the nursery sale of Bradford pear trees and any other pear trees grown on the commonly used Pyrus calleryana rootstock. The ban on sales began Oct 1, 2024, which is the annual nursery licensing renewal date in South Carolina. Ohio will become the first state on Jan 1, 2023, after passing regulations banning the sale of the species in 2018 with a 5-year grandfathering period. Additional information about the ban’s impact on homeowners can be found by visiting the Clemson University Home & Garden Information Center.

The additions of Pyrus calleryana — or Callery pear — along with three species of Elaeagnus to the State Plant Pest List met the approval of state agency representatives and the director of Clemson’s Regulatory and Public Service Programs. The clock is now ticking on a grandfathering period of a little more than 3 years for the nursery industry to comply with the new regulations by ceasing sale of these plant species.

University of Georgia. Center for Invasive Species and Ecosystem Health.

University of Pennsylvania. The Pennsylvania Flora Project of Morris Arboretum.

See also: Invasive Plant Fact Sheets for additional invasive plants in Pennsylvania

Indiana Department of Natural Resources. Invasive Plant Species Assessment Working Group.

See also: Species Assessments and Invasive Species for exotic animal and plant pests invading Indiana, causing economic and visual damage

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

Ohio Invasive Plants Council.

See also: Invasive Plants of Ohio for worst invasive plant species identified in Ohio's natural areas

Michigan Department of Natural Resource; Michigan State University Extension. Michigan Natural Features Inventory.

See also: Best Control Practice Guides for more guides

CAB International.

University of Georgia. Center for Invasive Species and Ecosystem Health.

USDA. FS. Institute of Pacific Islands Forestry.

USDA. NRCS. National Plant Data Center.

Southeast Exotic Pest Plant Council.