Synonyms: Eichhornia speciosa, Heteranthera formosa, Piaropus crassipes, Pontederia crassipes
Common names: water hyacinth
Eichhornia crassipes (water hyacinth) is a floating freshwater perennial (family Pontederiaceae) that jams rivers and lakes with tons of floating plant matter. Floating mats of this plant can weigh up to 200 tons per acre. In California, Eichhornia crassipes typically is found below 660 feet (200 m) elevation in the Central Valley, San Francisco Bay Area, and south coast.Cal-IPC Rating: High?
CDFA Rating: None?
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.
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
- Checking the threat and spread of invasive alien species through exploitation in Africa. Borokini, Israel. Vol 27, Issue 2
- Hawai’i: Ground zero for plant invasions - and EMAPi13!. Darin, Gina. Vol 23, Issue 3
- Wildland Weed News. Cal-IPC. Vol 22, Issue 2
- Weed biological control agents approved for California. Pitcairn, Michael J.; Smith, Lincoln; Moran, Patrick. Vol 22, Issue 1
- The cost of weeds to California. Brusati, Elizabeth. Vol 17, Issue 1
- Don’t sell a pest: A new partnership to prevent plant invasions through horticulture. Connick, Sarah; Gerel, Mike. Vol 13, Issue 2
- Foreign exploration for biological control of Arundo donax. Dudley, Tm. Vol 08, Issue 4
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.
- Update on recent biological control releases against invasive plants by the USDA-ARS. Moran, Patrick; Pratt, Paul; Smith, Lincoln (2022)
- Mapping waterhyacinth dispersal with GPS trackers. Miskella, John; Madsen, John (2018)
- Invasive aquatic weeds: implications for mosquito and vector management activities. Blair, Charles E. (2011)
- Invasive aquatic weeds: Implications for mosquito and vector management activities. Blair, Charles E. (2009)
- Partnering to prevent invasions of plants of horticultural origin. Connick, Sarah; Gerel, Mike (2004)
- Water gardening: Pathway to paradise or plant invasion? Crosson, Holly A. (2004)
- Aquatic weeds: Policy, prevention, and control. Anderson, Lars (2003)
- 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 Eichhornia crassipes Information
- Bugwood - National database from the Center for Invasive Species and Ecosystem Health at the University of Georgia.
- CalPhotos - Images of plants taken mostly in California.
- Calflora - Distribution map and records of this species in California.
- CalWeedMapper - Distribution map of this species in California with ability to determine regional priorities.
- EDDMapS - Distribution of this species in North America.
- Jepson Interchange - Information on this plant's taxonomy, biology, and distribution from UC Berkeley's Jepson Herbarium.
- USDA PLANTS Database - Information on identification and distribution, with links to websites in individual states.