Blackwood acacia (Acacia melanoxylon)
Photo by Forest and Kim Starr

blackwood acacia


  • This plant has a Plant Risk Evaluator rating of High Potential Risk
  • This plant has been rated Limited by the California Invasive Plant Council


Native to coastal areas of southeastern Australia, Acacia melanoxylon is a very fast growing tree that reaches 40 ft tall or more and 20 ft wide in maturity. It has aggressive roots that can lift sidewalks and damage foundations and plumbing. It has a propensity to sucker and reseed, and has leaf, seed pod, and branch litter. It is not ideal for street plantings for near living areas. It reproduces by seed, which can be spread by birds and float on water. The seeds germinate prolifically after fire.

It has escaped cultivation mostly in the San Francisco Bay area and in nearly every county along the coast of California, with only a few sightings inland. CalWeedMapper shows where it has been found in California growing outside of cultivation.

Why is this plant not included on the invasive plant list?

Blackwood acacia was included in the 2016 nursery survey as a candidate plant, and was only found at 1.2% of stores, which means that it does not meet all of the criteria to be added to the plant list.

More information

For more information about this plant, please see the following resources: