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Protecting Local Ecosystems: The West Multnomah Soil & Water Conservation District’s Invasive Species Program

WMSWCD staff and Ash Creek contractor, Aissa, are out in the field April 2024 for the start of our spring garlic mustard field season.

In the lush landscapes of Oregon, the West Multnomah Soil & Water Conservation District (SWCD) serves as a critical guardian of natural resources. Among its many initiatives, the district’s Invasive Species Program stands out as a vital effort to protect the region’s rich biodiversity and economy from the threats posed by invasive weeds.

Garlic mustard invasion at edge of Forest Park in Portland, OR. Garlic mustard is a shade tolerant species that threatens understory forest habitat.

Invasive plants are non-native species that outcompete native vegetation, disrupt ecosystems, and lead to severe economic consequences. Their rapid spread can degrade wildlife habitats, alter soil health, and threaten water quality. In western Multnomah County, the presence of invasive species like garlic mustard, knotweed, and spurge laurel is a serious concern. Without intervention, these species could dominate natural areas, displacing native plants and reducing biodiversity.

The conservation district’s Invasive Species program operates with a clear mission: “to locate and manage high-risk invasive weeds before they can become established in our region.” This proactive approach prioritizes targeting invasive species that pose the most significant threats while they are still manageable. By acting early, the district not only protects local ecosystems but also reduces the long-term costs and challenges of invasive species management.

Pacific Northwest Garlic Mustard Working Group co-founders Maria Winkler (King County Noxious Weed Control Program) and Michelle Delepine (WMSWCD) present at NAISMA 2024.

Michelle Delepine, the Invasive Species Coordinator for the district, recently shared insights from the program on a national stage. Presenting at the North American Invasive Species Management Association’s Annual Meeting and to the National Association of Conservation District’s Invasive Species Subcommittee, Michelle shared how West Multnomah SWCD’s program was able to address garlic mustard concerns on a landscape-level scale by bringing together partners across the region through the formation of the Pacific Northwest-Garlic Mustard Working Group.

Michelle emphasized that Early Detection and Rapid Response (EDRR) is a high priority within the region. This principle guides the program’s efforts to swiftly identify and address emerging invasive species before they can gain a foothold. She also highlighted the essential roles of the Pacific Northwest-Garlic Mustard Working Group, a dedicated group of partners from across Oregon, Washington, Alaska, British Columbia, and Alberta working continuously to map, manage, and mitigate the impacts of garlic mustard across the region.

West Multnomah SWCD staff and contractors hand pulling garlic mustard at the edge of Tryon Creek State Park in Portland, OR.

Over the years, the West Multnomah SWCD’s Invasive Species Program has achieved notable successes, including the reduction of garlic mustard infestations and the containment of knotweed in key watersheds. The program’s success is built on collaboration with local landowners, regional conservation organizations, and state agencies to amplify its impact. Looking ahead, the district aims to expand its reach, refine its strategies, and continue building community partnerships to ensure the long-term protection of West Multnomah’s natural resources.

By acting now, the West Multnomah SWCD is setting a powerful example of proactive conservation. Its Invasive Species Program is not just about protecting today’s landscapes; it’s about ensuring a thriving, resilient environment for generations to come.

For more information about the program and how to get involved, visit the West Multnomah SWCD website.

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