| APHIS Web: Noxious Weeds: APHIS has a major responsibility in preventing the spread of non-indigenous weeds into and through the United States. |
| Biological Control of Non-Indigenous Plant Species: Information and research from Cornell University on invasive plants. Information on Purple Loosestrife, Garlic Mustard, and Phragmites australis. |
| BLM National List of Invasive Weed Species of Concern: The United States Bureau of Land Management's list of invasive weed species of concern in regions where the agency has responsibilities (western United States). |
| BLM Weeds: The Bureau of Land Management's "Pulling Together-National Strategy for Invasive Plant Management". |
| California Exotic Pest Plant Council: Dedicated to finding solutions to problems caused by non-native pest plant invasions of the state's natural areas. |
| Connecticut Invasive Plant Working Group: Information about non-native invasive and potentially invasive vascular plants in Connecticut, USA. |
| Connecticut Policy on Non-Native Invasive Plant Species: State Department of Environmental Protection policy on non-native plant species. |
| Department of Transportation- Invasive Species Policy Guidelines: The Federal Highway Administrations directives on implementing the executive order on invasive species. |
| Eastern Region Non-Native Invasive Species: Information about management of exotic plant species in the forests of the northeastern United States. |
| Ecological Monitoring and Assessment Network: Discusses the need for monitoring, role of naturalists, use of research collections, research methods, and species identification. Article is by Erich Haber. |
| Environmental Weeds at Bream Head: A study of environmental weeds found on the coastal fringe of Bream Head and in private gardens at Ocean Beach and Urquharts Bay, Northland, New Zealand. |
| Federal Interagency Committee for the Management of Noxious and Exotic Weeds: Information about management of invasive weeds in the USA. |
| Florida Exotic Pest Plant Council: Includes information on invasive exotic species, database, proposed research and educational programs, control guides and management plans, mailing list, membership information, and links. |
| Georgia Exotic Pest Plant Council: Information about the adverse effects exotic pest plants have on the diversity plants and animals native to Georgia, USA. |
| Hawaii's Most Invasive Horticultural Plants: Overview of the problem, list of invasive garden plants, and species accounts from the Hawaii Division of Forestry and Wildlife. |
| Hawaiian Alien Plant Studies, UH Botany: A forum to promote public awareness and exchange of information regarding problems associated with the spread of alien plant species. |
| How Landowners Can Prevent Invasive Plant Species: Tips offered for the average homeowner, gardener. |
| How to Prevent the Spread of Noxious Weeds: Controlling weeds poses a special dilemma because, once a weed infestation is identified, it is often already so large that containment is difficult and expensive. |
| Idaho Weed Summit: The Spread of Invasive Weeds in Western Wildlands. |
| Influence of Invasive Species on Coastal Plant Communities: Abstracts of studies done on the California coast. |
| Institute of Pacific Islands Forestry - Invasive Plants in Hawaii: Information about investigations of the ecology of invasive plant species; impacts of invasive species on forest health, management and restoration. |
| Invasive Alien Plant Species of Virginia: Invasive species list, fact sheets, and list of native alternatives. |
| Invasive Grass Species In Southern Africa: Invasiveness of a perennial soil pathogen-sensitive grass (Ammophila arenaria) and an annual grass (Cenchrus biflorus) in Southern Africa are studied in relation to soil pathogens, mycorrhizal fungi and genetic structure. |
| Invasive Non-Native Plant Species: This is a list of vascular plant species which are invasive into "natural areas" in Connecticut. |
| Invasive Plant Atlas of New England: Maps and images of invasive species in the northeastern U.S. |
| Invasive Plants: Information from the Canadian Botanical Conservation Network. Includes species list, facts about economic costs, and bibliography. |
| Invasive Plants Association of Wisconsin: Educational non-profit organization concerned with the control of exotic plant species in Wisconsin (USA). |
| Invasive Plants of Natural Habitats in Canada: Discusses invasive species, methodology, and relevant legislation in Canada. |
| Invasive Plants: Changing the Landscape of America: Fact Book: Full text of 1998 publication by Randy Westbrooks, USDA-APHIS. |
| Invasive Species: USGS Biological resources that deal with invasive plant species. |
| Invasive Weeds: Photos and descriptions of invasive, noxious, and troublesome plants of North Dakota. Includes articles and weed control guide. |
| Invasive Woody Plants in the Tropics Research Group: Global review of invasions resulting in a comprehensive database, an analysis of common characteristics and recommendations for management and control. |
| MetroActive News & Issues: Alien Plants: The dreaded Arundo, also known as giant reed grass, coming soon to a neighborhood near you. |
| Mid-Atlantic Exotic Pest Plant Council: Addresses the problem of invasive exotic plants in the Mid-Atlantic region of the US. Brochure, e-mail group, organizational information, and links. |
| Non-Native Invasive Terrestrial Plants in Florida: Descriptions and images of 12 of the most invasive terrestrial plants in Florida. |
| Norwalk River Watershed Invasive Species: Common and scientific species names along with detailed information about the particular invasive plant. |
| Pacific Island Ecosystems at Risk: Listings and descriptions of invasive plant species which threaten Pacific island ecosystems, particularly those of Micronesia and American Samoa. |
| Plant Conservation Alliance - Alien Plant Working Group: is a web-based project of the PCA that provides information for the general public, land managers, researchers, and others on the serious threat and impacts of invasive alien (exotic, non-native) plants to the native flora, fauna, and natural ecosystems of the United States. |
| Redwood National and State Parks: Exotic plant management of the over 190 exotic species invading Redwood Parks. |
| Southeastern Exotic Pest Plant Council: Information about exotic plants invading natural areas in the southeastern states, controlling invasive plants, and landscaping with native plants. |
| Southwest Exotic Plant Mapping Program: A collaborative program designed to develop a regional database of exotic plant distributions for the southwest. |
| The Invasive Plant Council of New York State: A not-for-profit organization that provides guidance on the management of invasive plants with the goal of protecting biodiversity in New York (USA). |
| The Worst Invasive Species: The Nature Conservancy's national program for dealing with harmful invasive plant species on its preserves. |
| TNC Wildland Weeds Management & Research: The Nature Conservancy's U.S. program for dealing with harmful invasive plant species threatening wild land biodiversity and invading TNC preserves. Site has weed alerts and resources on weed control. |
| VA NHP Invasive Alien Plant Cooperative Project: The Virginia Native Plant Society (VNPS) and the Department of Conservation and Recreation share a commitment to protect native plant habitats from the threat of invading exotics. |
| Weed Risk Assessment: evaluates the risks associated with the introduction of exotic plants not present, and those recently introduced and considered to pose a threat to agriculture and the environment |
| Wisconsin Department of Natural Resources - Invasive Species: Information about invasive plant and animal species in Wisconsin. Includes many detailed fact sheets. |
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