Cal-IPC Projects

  • Volutaria

    Desert Knapweed Containment

    Volutaria tubuliflora, or desert knapweed, is a plant from north Africa that has recently been found in California. These are the only known sites in North America. There are two small sites on the coast in San Diego County and Orange County, and a major infestation in Borrego Springs, 50 miles inland in the Sonoran Desert. This infestation has spread over 15 square miles, and range modeling shows that desert knapweed would find suitable conditions across the American Southwest. in the 2016 superbloom, partners mapped and removed populations across the area during the January to April...Read More
  • Knotweed

    Northcoast Knotweed Eradication

    Invasive giant knotweeds routinely make the list of the worst invasive species in the world. They have wreaked havoc in western Oregon and Washington, taking over riparian areas. There are only a handful of infested areas in California, and the main challenge is on the north coast, in Humboldt and Del Norte counties. Multiple species of knotweed, including Japanese knotweed (Fallopia japonica), giant knotweed (F. sachalinensis) and Himalayan knotweed (Periscaria wallichii) are found in the region, at about 100 sites in all. Knotweeds are notoriously difficult to get...Read More
  • Limonium

    SF Bay Sea Lavender Control

    Cal-IPC and partners prioritized Algerian sea lavender (Limonium ramosissimum) and European sea lavender (L. durisculum) as top priorities for removal to protect San Francisco Bay tidal marshes. These plants are found in several other locations along the California coast (for instance, Morro Bay, Carpenteria Marsh near Santa Barbara, and San Diego), and are a prime candidate for early eradication before they spread further. California's salt marsh habitat is home to a unique assemblage of plants and wildlife, and much of this habitat has been lost to development. Few weed spe...Read More
  • Interns with the Student Conservation Association hand-pull dandelions (Taraxacum officinal) in Matterhorn Canyon, Yosemite National Park, alongside NPS staff. Photo: Michael Diehl

    Sierra Nevada Meadows Protection

    Sierra Nevada meadows are valued for their ecosystem functions, regulating water storage and flow, and providing important wildlife habitat. Invasive plants can significantly alter vegetation communities, degrade wildlife habitat, and potentially reduce water storage and carbon sequestration functions. Our project improves understanding of these impacts and strengthens capacity to effectively address the threat. The primary activity of this project is characterizing the level of threat in Sierra meadows from invasive plants through development of a “vulnerability index” based on current...Read More
  • Multiple teams recording data at the Carpinteria Salt Marsh CHMA Surveys

    South Central Coast Eradication

    This project targets five invasive plant species for region-wide eradication in the South Central Coast region (San Luis Obispo and Santa Barbara counties): Canada thistle, Russian wheatgrass, Japanese dodder, Dalmation toadflax and European sea lavender. Eradication is the gold standard of invasive plant control because it means the threat from that species has been eliminated (unless the species is re-introduced to the region). It is more effective and more cost-effective than long-term ongoing containment. The species in this effort were prioritized through a comprehensive assessment with r...Read More