Delairea odorata

Delairea odorata_cape ivy_JM DiTomaso
Photo courtesy Joseph DiTomaso

Synonyms: Senecio mikanioides

Common names: Cape-ivy; German ivy; Italian ivy; ivy groundsel; parlor ivy; water ivy

Delairea odorata (=Senecio mikaniodes) (Cape-ivy, German-ivy) is a perennial vine (family Asteraceae) found along the coast of California and in the San Gabriel Mountains. Cape-ivy is especially problematic in coastal riparian areas, though it may also invade inland riparian areas, moist forests, and oak woodlands. Vines are known to form dense mats of vegetation over trees and shrubs, killing plants underneath. It is toxic to animals and fish can be killed when plant materials are soaking in waterways. Stem, rhizome and stolon fragments resprout if left in the ground after treatment.

Cal-IPC Rating: High

Cal-IPC Assessment

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 RIC 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

Cal-IPC Symposium Presentations

  • Kesel, R. (2009). Urban invasions: Analyzing recovery of habitat fragments in San Francisco following the removal of Genista monspessulana and Delairea odorata. Cal-IPC Symposium 2009. Visalia, CA, California Invasive Plant Council.
  • Stern, J. and F. Watson (2008). An Assessment of Control Methods for Cape ivy in Coastal Riparian Ecosystems. California Invasive Plant Council Symposium 2008. Chico, CA, California Invasive Plant Council.
  • Molinari, N., K. Seward, et al. (2007). Ecology and future biocontrol of cape ivy in southern California. California Invasive Plant Council Symposium 2007. San Diego, CA, California Invasive Plant Council.
  • Knapp, J., S. Ratay, et al. (2007). Eradicating 25 species- Challenges and successes of switching from population to seed bank management on Catalina Island, California. California Invasive Plant Council Symposium 2007. San Diego, CA, California Invasive Plant Council.
  • Burns, C. and S. Adams (2007). Trials on chemical control of periwinkle (Vinca major) and Cape ivy (Delairea odorata). California Invasive Plant Council Symposium 2007. San Diego, CA, California Invasive Plant Council.
  • Baxter, T. and J. Bromberg (2005). Cape ivy removal at Golden Gate National Recreation Area and Point Reyes National Seashore. California Invasive Plant Council Symposium 2005. Chico, CA.
  • Bossard, C., K. Moore, et al. (2005). A test of repeat flaming as a control for poison hemlock (Conium maculatum), Cape ivy (Delairia odorata), and periwinkle (Vinca major). California Invasive Plant Council Symposium 2005. Chico, CA.
  • Balciunas, J. (2004). Biological control of Cape ivy: Coming soon? California Invasive Plant Council Symposium 2004. Ventura, CA.
  • Giessow, J. and M. Newhowser (2004). Riparian working group. California Invasive Plant Council Symposium 2004. Ventura, CA.
  • Knapp, J. (2004). A gardener's dream, a land manager's nightmare: The spread of horticultural invasive plants into the wildlands of Santa Catalina Island. California Invasive Plant Council Symposium 2004. Ventura, CA.
  • Robison, R. (2004). Reproductive biology of cape ivy (Delairea odorata) in California. California Invasive Plant Council Symposium 2004. Ventura, CA.
  • Carruthers, R. and J. Buettner (2003). Biocontrols: Progress and ongoing needs. California Invasive Plant Council Symposium 2003. Kings Beach, CA.
  • Dudly, T. (2003). Riparian invaders: A multi-species approach. California Invasive Plant Council Symposium 2003. Kings Beach, CA.
  • Blumin, L. and D. Gluesenkamp (2002). Manual removal of cape ivy in volunteer canyon - Bolinas Lagoon Preserve, Audubon Canyon Ranch, Stinson Beach, California. California Exotic Pest Plant Council Symposium 2002. Sacramento, CA.
  • Shoulders, C. (2001). Successful removal of cape ivy and recovery of riparian vegetation on two acres along Redwood Creek, Marin County: Changes in cover three years after removal. California Exotic Pest Plant Council Symposium 2001. San Diego, CA.
  • Grobbelaar, E., J. Balciunas, et al. (2000). A survey in South Africa for insects with potential as biological control agents for cape ivy (Delairea Odorata Lemaire). California Exotic Pest Plant Council Symposium 2000. Concord, CA.
  • Hamingson, E. E. and M. E. Alvarez (2000). Assessing cape-ivy control in two California National Parks. California Exotic Pest Plant Council Symposium 2000. Concord, CA.
  • Benefield, C. B. (1999). Private and public funding opportunities: Sources of funding for weed management programs. California Exotic Pest Plant Council Symposium '99. Sacramento, CA.
  • Cooper, V. K. and B. J. Moritsch (1999). Weeding the wilderness: Non-native plant management at Point Reyes National Seashore. California Exotic Pest Plant Council Symposium '99. Sacramento, CA.
  • Robison, R., E. Grotkopp, et al. (1999). Cape Ivy (Delairea odorata) distribution in California and Oregon. California Exotic Pest Plant Council Symposium '99. Sacramento, CA.
  • Archbald, G. (1998). Mechanical control methods: beyond weed bashing. California Exotic Pest Plant Council Symposium '98. Ontario, CA.
  • Alvarez, M. E. (1997). Management of cape-ivy (Delairea odorata) in the Golden Gate National Recreation Area. California Exotic Pest Plant Council Symposium '97. Concord, CA.
  • Farrell, S. (1997). Stewardship and resource education at the Presidio. California Exotic Pest Plant Council Symposium '97. Concord, CA.
  • Bossard, C. and C. Benefield (1995). War on German ivy: good news from the front. California Exotic Pest Plant Council Symposium '95. J. Lovich, J. Randall and M. Kelly. Pacific Grove, CA.

Other Delairea odorata Information

  • CalPhotos - Images of plants taken mostly in California.
  • Calflora - See the distribution of this species on Calflora's map of California.
  • CalWeedMapper - Distribution information with ability to determine regional priorities.
  • Jepson Online Interchange for California Flora - Information on taxonomy, biology, and distribution from UC Berkeley's Jepson Herbarium.
  • USDA PLANTS Database - Federal database with information on identification and distribution, and links to websites in individual states.