Santa Margarita - San Luis Rey Weed Management Area

Invasive Non-native plants

(Giant reed)

(Perennial pepperweed)

(Hoary cress)


(Bridal broom)

(Tamarisk, salt cedar)

(Cape/German ivy)

(Yellow star thistle)

Non-native plants of concern

(Bridal creeper, smilax, asparagus vine)

(Purple loosestrife)

(Giant salvinia)

Our Mission

The Santa Margarita and San Luis Rey Watersheds Weed Management Area was formed to provide support, coordination and funding for management of invasive non-native plants and restoration of native riparian habitat within the Santa Margarita and San Luis Rey watersheds in San Diego and Riverside Counties. This web site provides information on our projects, control methods and invasive non-native plants of concern.


February 1, 2011:  San Diego and Santa Margarita/San Luis Rey Weed Management Areas Annual Joint Meeting

Summary of Arundo control

Goals of the Weed Management Area:

1) Provide the information, expertise, organization and support necessary for the control of invasive non-native plants in the Santa Margarita and San Luis Rey watersheds on a watershed scale. This means working from the top of the watershed towards the bottom so that control sites are not re-infected by upstream sources.

2) Continue the control of Arundo donax (giant reed) on the San Luis Rey watershed. As of November 2000 the WMA has treated Arundo from the uppermost infestation on the San Luis Rey watershed (at Wilderness Gardens County Park) downstream to Hansen Aggregates. Several control projects are planned for 2001.

3) Develop funding resources for the maintenance of the WMA and the continued invasive plant removal efforts in the Santa Margarita and San Luis Rey watersheds.

4) Finish mapping Arundo in the uppermost portions of the Santa Margarita watershed (i.e. above Temecula) and use this information to guide the implementation of projects to remove the remaining Arundo sources that are identified. These Arundo plants jeopardize the success of downstream control projects.

5) Continue the management, monitoring and re-treatment of Arundo control projects on the Santa Margarita watershed initiated in Fall 2000.

6) Create a comprehensive database that will contain all information on all completed and pending invasive plant control projects and plant distributions in the two watersheds. This information resource center will be used by the WMA for compiling all mapping efforts into a comprehensive and accessible format, to aid in developing invasive plant control plans, to provide the information necessary in implementing specific invasive plant control projects (e.g. sensitive species distributions), and as a means to monitor all projects over the long-term. This resource will be accessed over the WMA's website.

7) Continue educational outreach to increase awareness on the negative impacts of non-native invasive species and the identification of these species. Outreach will be done through holding meetings, attending meetings (local, regional, state), the website, and local newspaper articles.

The SMSLR Weed Management Area is the proud recipient of the following grants:

§  National Fish and Wildlife Foundation, Pulling Together Initiative Grant: Awarded first grant in 1999 and second year of funding in 2000.

§  Urban Stream Restoration Grant, Department of Water Resources: Live Oak Creek, awarded 10/01.

§  Urban Stream Restoration Grant, Department of Water Resources: Ostrich Creek, Awarded 2002.

§  Environmental Enhancement and Mitigation Grant, California Resources Agency: For Ostrich Creek, Awarded 2002.

§  Southern CA Wetlands Recovery Program, CA Coastal Conservancy: For main stem of the SLR River, Awarded 2003.

§  Watershed Protection Grant Program, SWQCB: For upper San Luis Rey watershed, Awarded 2003.

§  Wildlife Conservation Board (WCB), DFG, CA Resources Agency: For Arundo control & restoration on main stem of San Luis River, Awarded 2006.

§  River Parkways Grant Program, CA Resources Agency: For Arundo control and restoration and bike trail on main stem of San Luis Rey River above College Ave, Awarded 2006.

§  Coastal Nonpoint Source Pollution Control Program, SWRCB: For Arundo control and restoration on main stem of San Luis Rey River, Awarded 2007.