Invasive Weeds in Los Angeles County
For more information on invasive weeds, including biology and control of listed weeds, look at the encycloweedia located at the California Department of Food and Agriculture website.
What is a Weed Management Area?
Weed Management Areas (WMAs) are local organizations that bring together landowners and managers (private, city, county, state, and federal) in a county, multi-county or other geographical area to coordinate efforts and expertise against invasive weeds.
The WMA functions under the authority of a mutually developed Memorandum of Understanding and is subject to statutory and regulatory weed control requirements. In California, such groups are usually initiated by the County Agricultural Commissioner's Office or a federal agency employee and voluntarily governed by a chairperson or steering committee. WMAs are unique because they attempt to address both agricultural weeds and wildland weeds under one local umbrella organization.
WMAs use many effective outreach weed management methods, such as printing weed identification/control brochures; organizing weed education events; writing and obtaining grants; and coordinating joint demonstration projects; weed eradication and mapping efforts.
The California Department of Food and Agriculture (CDFA) helps to coordinate and support WMAs. To learn more about them and WMAs statewide, click the button below. For information about the Los Angeles County Weed Management area, visit their website by clicking the button below.
Why is it important to control invasive weeds?
It is well known that some non-native plant and animal species can become established and out-compete native species and actually reduce or degrade an area's natural diversity.
Non-native invasive weeds are increasingly being recognized as some of the most destructive and rapidly spreading of the invasive species. Some are poisonous, others interfere with agriculture, and still others simply become so numerous, practically nothing else has room left to live!
Invasive weeds are spreading on private and public lands. The US Forest Service estimates that as much as several thousand acres of public lands a day are being lost nationwide to invasive non-native weeds. To get your kids involved, visit the Just For Kids website by clicking the button below to learn more about the environment.
Weed Management Area Activities
The LA County WMA meets quarterly at the Los Angeles County Agricultural Commissioner/ Weights & Measures Department office, at 12300 Lower Azusa Road in Arcadia. The meetings start at 10:00 a.m., and generally last until noon. Future meetings are announced through E-mail. To be placed on the E-mail list, call Rose at 626.575.5462
The LA County WMA is currently undertaking several projects to begin the process of effectively managing some of the most invasive weeds in the County. Starting in 2001, we began conducting surveys of selected invasive plants based on the threat they posed to the environment and the ability to control them. Some of our specific control projects are listed below.
Major Invasive Weeds in Los Angeles County
There are many species of invasive weeds known to exist in Los Angeles County. Of these only three (that we know about) are considered highly invasive and are listed as "A" rated by the California Department of Food and Agriculture (CDFA). All three are targets of eradication efforts aimed at completely eliminating them from the County. Sightings should be reported to the County Agricultural Commissioner's Office. They are listed below.
Other Weeds of Concern
What can you do to help?
Use weed-free forage when horseback riding on public lands.
Keep on the lookout for unusual plants while in the outdoors, and report them to the local Agricultural Commissioner's office.
Volunteer to help with an invasive weed control project in your area by contacting any of the members of the Weed Management Area listed here.
Take classes in weed identification, botany, etc., and then volunteer at local parks or wildlife areas to help spread the word about the importance of controlling invasive weeds.
Become informed about local planning issues that may involve the control or spread of invasive weeds.
Support legislation directed towards invasive species control, suppression, or eradication.