Common names: purple loosestrife
Lythrum salicaria (purple loosestrife) is a wetland herb (family Lythraceae) that invades scattered freshwater wetlands of northern and central California. Infestations are found in northern California and the San Francisco Bay Area, as well as along rivers in the southern Sierra. It is a hardy perennial that can rapidly degrade wetlands, diminishing their value for wildlife habitat.Cal-IPC Rating: High
CDFA Rating: B
Plant Assessment Form - Information gathered by Cal-IPC on the impacts, rate of spread, and distribution of invasive plants in California. Does not include management information.
Species ID Card
Invasive Species ID Card - To support field identification of early detection species, Cal-IPC has designed a set of Species ID cards that can be downloaded, printed double-sided, and trimmed to size.
Weed Management Notes
- Management Notes - Information on management techniques and effectiveness from the University of California Cooperative Extension’s Weed Research & Information Center.
Cal-IPC Newsletter Articles
- Protecting San Diego wetlands. Cal-IPC. Vol 24, Issue 1
- Weed biological control agents approved for California. Pitcairn, Michael J.; Smith, Lincoln; Moran, Patrick. Vol 22, Issue 1
- Tracking eradication progress . Guise, Vince. Vol 21, Issue 3
- Chasing weeds from Maine to California. Stack, Lois Berg. Vol 16, Issue 4
- Biological control of invasive exotic pest plant species: A report on the importance of maintaining and enhancing our nation’s biological control capabilities. CalEPPC. Vol 03, Issue 3
Cal-IPC Symposium Presentations
Presentations are linked where available. Where a presentation is not available, find more information by reading the abstract in the Cal-IPC Symposia Archive.
- Partnering with California Conservation Corps on large scale weed removal in the Oroville Wildlife Area. Ferrara, Holly (2019)
- Efficacy and safety of new herbicides on the horizon. DiTomaso, Joseph M. (2005)
- Flood-borne noxious weeds: Impacts on riparian areas and wetlands. Donaldson, Susan G. (1997)
- The search for patterns or what determines the increased competitive ability of invasive non-indigenous plants? Blossey, Bernd (1996)
- Federal regulatory efforts to minimize the introduction and impacts of exotic pest plants in the United States. Westbrooks, Randy G. (1995)
- Use of biologically based methods to control pest plants:Issues related to federal research, regulation, and implementation. Chornesky, Elizabeth A.; Palmer, Cynthia M. (1995)
Other Lythrum salicaria Information
- CalPhotos - Images of plants taken mostly in California.
- Calflora - See the distribution of this species on Calflora's map of California.
- CalWeedMapper - Distribution information with ability to determine regional priorities.
- Jepson Online Interchange for California Flora - Information on taxonomy, biology, and distribution from UC Berkeley's Jepson Herbarium.
- CDFA - California official noxious weeds.
- USDA PLANTS Database - Federal database with information on identification and distribution, and links to websites in individual states.
- Bugwood - National database from the Center for Invasive Species and Ecosystem Health at the University of Georgia.
- EDD MapS - North American distribution based on Early Detection and Distribution Mapping System.