- Allelopathic Links
 - Directory devoted to sites studying the suppression of growth of one plant species by another. - Center for Aquatic and Invasive Plants - University of Florida
- Aquatic plant database, images, drawings, video programmes, and more.
- Center for Invasive Plant Management
- Promoting ecologically based management of invasive plants, and working toward desired plant communities.
- Control of Invasive Non-Native Plants
- Guide for gardeners and homeowners in the Mid-Atlantic Region.
- eNature: Native Gardening and Invasive Plants Guide
- Designed to help gardeners find and recommended native garden plants in their state and lists of some of the plants that are best avoided in the garden because they can be weedy or invasive.
- Exotic and Invasive Species on the Colorado Plateau
- Discusses the introduction of saltcedar and cheatgrass, two of the most prevalent and problematic exotics in the region.
- Hawaii's Most Invasive Horticultural Plants: An Introduction
- Provides a list which includes links to detailed species information pages and photos.
- Hawaiian Alien Plant Studies
- Forum to promote public awareness and exchange of information regarding problems associated with the spread of alien plant species from the University of Hawaii Botany Department.
- Impact of Invasive Plants on Species and Habitats at Risk in Canada
- Report by Erich Haber, National Botanical Services.
- Invasive Exotic Plants of Canada
- Fact sheet addressing terrestrial and aquatic plants invading Canadian ecosystems.
- Invasive Grass Species in Southern Africa
- Studying the invasiveness of a perennial soil pathogen-sensitive grass and an annual grass in relation to soil pathogens, mycorrhizal fungi, and genetic structure.
- Invasive Plant Council of New York State (IPC)
- Partnership dedicated to solving invasive plant species problems in New York State.
- Invasive Plants in the Upper Valley
- Looks at how purple loosestrife, garlic mustard, glossy buckthorn, and shrub honeysuckles are a major threat to bio-diversity of the Upper Connecticut River Valley.
- Invasive Plants of Canada (IPCAN)
- Initiative of the National Botanical Services, compiling information on the biology, distribution, and control of invasive exotic plants and developing databases for computer mapping and analysis.
- Invasive Weeds: A Growing Pain
- An educational site from the Bureau of Land Management with an introduction to weeds and a look at how to prevent the spread of noxious weeds.
- Invasive Woody Plants in the Tropics Research Group - University of Wales
- Conducting two field studies in Jamaica and Tanzania.
- Pacific Island Ecosystems at Risk (PIER)
- Working to compile information on exotic plant species of known or potential threat to the Pacific island ecosystems of Micronesia and American Samoa. From the Institute of Pacific Islands Forestry.
- PlantRight
- Guide identifies invasive plants that have been problematic in California and offers noninvasive alternatives for each of California's regions.
- Southern Appalachian Native Plant and Invasive Species Initiative
- Workshops and symposiums held by the Southern Appalachian Man and the Biosphere Programme.
- USDA APHIS Plant Protection and Quarantine - Noxious Weeds
- Committed to using modern technologies to exclude, delimit, suppress, and eradicate non-indigenous weeds from the United States.
- Weeds Gone Wild: Alien Plant Invaders of Natural Areas
- Web-based project that provides information for the general public, land managers, researchers, and others on the serious threat and impacts of invasive alien plants to the native flora, fauna, and natural ecosystems of the United States.
- Wildland Invasive Species Program
- Information on invasive plants threatening the biodiversity of U.S. wild lands.
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