Acacia dealbata

Acacia dealbata_silver wattle_JM DiTomaso
Photo courtesy Joseph DiTomaso

Synonyms: Acacia decurrens var. dealbata

Common names: silver wattle

Acacia dealbata (silver wattle) is a tree (family Fabaceae) found in the coastal ranges, San Francisco Bay area, and south coast of California. It favors disturbed places in coastal prairies, riparian areas and coniferous forests. Silver wattle is often confused with green wattle (Acacia decurrens), but is distinguishable by the small, silvery hairs that grow on its twigs. It spreads via rhizomes and seeds, and easily resprouts after being cut. Acacia dealbata changes soil chemistry by fixing nitrogen, and the plants’ fallen leaves may have allelopathic effects that prevent the growth of native understory plants. Like many acacias, silver wattle is commonly planted as an ornamental.

Rating: Moderate

Cal-IPC Resources

  • 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.
  • CalWeedMapper - Statewide maps, climate models, and reports.
  • Cal-IPC News - Our quarterly newsletter. Each issue is available as a pdf.
  • Cal-IPC Symposium Proceedings - Presentations and papers from our annual Symposium.
  • Don't Plant a Pest! - Select your region to find non-invasive alternatives to ornamental species. Also see our statewide brochure on trees.

Other Resources

  • USDA PLANTS database -
    Federal database with information on identification and distribution, and links to websites in individual states.
  • Jepson Online Interchange for California Flora - Information on taxonomy, biology, and distribution from the UC Berkeley Jepson Herbarium.
  • CalFlora - Distribution information by county based on submitted observations and herbarium specimens.
  • CalPhotos - Images of plants taken mostly in California.
  • Natural Resource Projects Inventory - State database with information on resource management projects throughout California. Query by the species of interest.

Symposium Presentations

  • Horowitz, M. (2003). Alternatives to chemical stump treatment of Acacia dealbata. California Invasive Plant Council Symposium 2003. Kings Beach, CA.

Cal-IPC News Articles

  • DiTomaso, J. (1998). Results of the CalEPPC questionnaire at Symposium '98 in Ontario.
  • (1993). California Exotic Pest Plant Council draft list exotic plants of greatest concern October 1993.