APHIS has a major responsibility in preventing the spread of non-indigenous weeds into and through the United States.

Information and research from Cornell University on invasive plants. Information on Purple Loosestrife, Garlic Mustard, and Phragmites australis.

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).

The Bureau of Land Management's "Pulling Together-National Strategy for Invasive Plant Management".

Dedicated to finding solutions to problems caused by non-native pest plant invasions of the state's natural areas.

Information about non-native invasive and potentially invasive vascular plants in Connecticut, USA.

State Department of Environmental Protection policy on non-native plant species.

The Federal Highway Administrations directives on implementing the executive order on invasive species.

Information about management of exotic plant species in the forests of the northeastern United States.

Guide to Monitoring Exotic and Invasive Plants.

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.

A searchable database providing citations and summaries of literature pertinent to controlling invasive exotic plants.

Information about management of invasive weeds in the USA.

Includes information on invasive exotic species, database, proposed research and educational programs, control guides and management plans, mailing list, membership information, and links.

Information about the adverse effects exotic pest plants have on the diversity plants and animals native to Georgia, USA.

Overview of the problem, list of invasive garden plants, and species accounts from the Hawaii Division of Forestry and Wildlife.

A forum to promote public awareness and exchange of information regarding problems associated with the spread of alien plant species.

Tips offered for the average homeowner, gardener.

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.

The Spread of Invasive Weeds in Western Wildlands.

Abstracts of studies done on the California coast.

Information about investigations of the ecology of invasive plant species; impacts of invasive species on forest health, management and restoration.

Invasive species list, fact sheets, and list of native alternatives.

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.

This is a list of vascular plant species which are invasive into "natural areas" in Connecticut.

Maps and images of invasive species in the northeastern U.S.

Information from the Canadian Botanical Conservation Network. Includes species list, facts about economic costs, and bibliography.

Educational non-profit organization concerned with the control of exotic plant species in Wisconsin (USA).

Full text of 1998 publication by Randy Westbrooks, USDA-APHIS.

USGS Biological resources that deal with invasive plant species.

Workshops from 1997 and 1997 dealing with invasive species.

Photos and descriptions of invasive, noxious, and troublesome plants of North Dakota. Includes articles and weed control guide.

Global review of invasions resulting in a comprehensive database, an analysis of common characteristics and recommendations for management and control.

The dreaded Arundo, also known as giant reed grass, coming soon to a neighborhood near you.

Addresses the problem of invasive exotic plants in the Mid-Atlantic region of the US. Brochure, e-mail group, organizational information, and links.

Brochure for Ontario gardeners about how exotic trees, shrubs, and herbs found their way into gardens and natural areas.

Descriptions and images of 12 of the most invasive terrestrial plants in Florida.

The spread of nonindigenous plants threatens biological diversity and the functioning of natural ecosystems throughout the United States.

Common and scientific species names along with detailed information about the particular invasive plant.

Listings and descriptions of invasive plant species which threaten Pacific island ecosystems, particularly those of Micronesia and American Samoa.

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.

Exotic plant management of the over 190 exotic species invading Redwood Parks.

Information about exotic plants invading natural areas in the southeastern states, controlling invasive plants, and landscaping with native plants.

A collaborative program designed to develop a regional database of exotic plant distributions for the southwest.

Literature reviews on the taxonomy, ecology, distribution, and control options for numerous species of exotic plants at three national monuments in the upper Midwest.

The threat that invasive weeds pose to the High Plains Ecosystem is discussed.

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 Nature Conservancy's national program for dealing with harmful invasive plant species on its preserves.

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.

Scientists Speak on Rare Plants and Invasive Species at Santa Barbara Symposium.

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.

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

Information about invasive plant and animal species in Wisconsin. Includes many detailed fact sheets.