Source: California Invasive Plant Council

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Acacia dealbata (silver wattle)

Acacia dealbata
Acacia dealbata
Photo courtesy Joseph DiTomaso

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 plantsí 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.

Cal-IPC Inventory rating: Moderate

Cal-IPC Resources on Acacia dealbata

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.

Cal- IPC Symposium Proceedings

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

Other Resources on Acacia dealbata

  • 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.