P.O. Box 1961, West Sacramento, CA 95691     (831) 442-0883     (831) 442-2351

 A big thank you to those who attended the

2020 Annual Conference! 

We are proud to have brought together an amazing group of speakers, sponsors, exhibitors and attendees.

The conference proceedings will become available soon, so please check back.

Be sure to mark your calendar for the 2021 Annual Conference being held January 27th – 29th at the beautiful Hilton Santa Barbara Beachfront Resort!


2020 Student Scholarship Application is available here. Application deadline is May 29, 2020


Journal and Research Update December 2019 Issue  



Save the dates!

California Weed Science Society
2021 Annual Conference
Santa Barbara, California
January 27-29, 2021 (registration will open in August 2020)



Voting privileges are open to
Regular, Student, and Honorary members only.

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Principles of Weed Control 4th Edition

This is a weed management book with a focus on California’s unique mix of crops, but with relevance to other areas as well. The book is for sale at Amazon and Barnes and Noble in ebook and paperback editions.


Weeds of California This new weed identification book has been in the making for over 6 years. It is the most comprehensive weed identification book yet produced in the United States. It contains over 3000 color photos of infestations and whole…


Aquatic and Riparian Weeds of the West This is practical guide to the identification and biology of submerged, floating leaved, and emergent aquatic weeds in the Western United States. The book contains a full description of 89 species representing 36 plant families…


Ecology of Weeds and Invasive Plants: Relationship to Agriculture and Natural Resource Management, 3rd Edition The Third Edition of the authoritative reference gives readers an in-depth understanding of how weeds and invasive plants develop and interact in the environment so they can manage and control…


There are times in the history of any organization when the members should pause and re-examine the reasons for existence of the organization, the purposes of the organization, and the goals toward which it is striving. And there are times for remembering those who were responsible for the organization’s inception, and for its program and achievements.

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The CWSS will be the premier authoritative source of information on weed biology and weed management in California and will serve as a forum for all individuals interested in these disciplines.


The California Weed Science Society provides information exchange on weed science and technology through an annual conference, publications, and other activities; advises stakeholders on matters pertaining to weeds; facilitates cooperation among individuals, agencies…

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2020 Conference Sponsors 


Get the latest news about weed science, new events, and organization updates.