- Australian National Botanic Gardens: Environmental Weeds in Australia
- Contains information table featuring various species of weeds.
- Calweed Database
- Clearing-house for noxious weed control projects in California.
- Environmental Weeds Action Network
- Aims to promote information and understanding of environmental weeds in bushland and waterways.
- Integrated Weed Control
- Offers biological products and consulting services for managing weeds.
- International Parthenium Research News Group
- Information about Parthenium hysterophorus L., one of the worst weeds in the world. Related articles also provided.
- International Survey of Herbicide Resistant Weeds
- Aims to monitor the evolution of herbicide-resistant weeds and assess their impact throughout the world.
- Iowa State Weed Science
- Access to links, references, and articles pertaining to weed science.
- Japanese Knotweed Solutions Limited
- UK company offers Japanese Knotweed identification, control and eradication solutions with a ten year insurance backed warranty.
- New Jersey Weed Gallery
- Compilation of photos and descriptions of different weeds found in New Jersey.
- Noxious Weeds in the US and Canada
- Searchable database featuring various noxious weeds found in the US and Canada.
- University of California Weed Research and Information Center
- Fosters research and education in the field of weed management.
- University of Nebraska Weed Science
- Contains details about the program along with details on weed identification, research, and education.
- Virginia Tech Weed Identification Guide
- Contains a list of references, botanical descriptions, grass weed identification key, extension publications, and scientific name index.
- Weed Science Society of America
- Fosters research, education and extension activities pertaining to weed management.
- Weeds of National Significance
- Contains data and analysis of determining weeds with national importance.
- Weeds Society of Western Australia
- Represents research scientists, extension officers, consultants, company representatives, conservationists, other practitioners and members of the public who have an interest in weed management.
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