Global Compendium of Weeds (GCW) Hawaiian Ecosystems at Risk project (HEAR) Western Australia Department of Agriculture (AgWest) Global Compendium of Weeds

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The Global Compendium of Weeds is a list of plant species (over 28,000 names) that have been cited in specific references (approximately 1,000) as weeds. An expert has assessed the status of the weed based on its context in each document. Sometimes, additional information--such as native range, whether the plant has reported medical/herbal uses, etc.--is included when available.

This website is a collaborative venture between AgWest (data & weed expertise) and the Hawaiian Ecosystems at Risk project (HEAR) (database consultation & website management).

The inclusion of a species ) in the Global Compendium of Weeds [GCW] does not necessarily indicate that the GCW author or sponsors (or the sponsors of the hosting website) consider the species a weed, nor do those entities vouch for the veracity of any particular source; the GCW is simply an attempt to provide summary information from a wide range of documented sources.

Read the introduction PDF icon to the GCW book (2002 ed.) for information about how to interpret the information presented at this website.

Although the data on this website are more current* than the 2002 book (printed), as of this writing, the 2017 version of A Global Compendium of Weeds is the most current available edition of the book.

*A small number [perhaps several hundred] species/reference combinations are missing from this online version due to data conversion issues.

If you have corrections, can recommend additional source documents, or require further information about the GCW, please contact

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This page was created on 26 September 2007 by PT, and was last updated on 23 March 2023 by PT based on data from Rod Randall's Global Compendium of Weeds database dated 24 January 2007.