SelecTree: Tree Detail
Photo Locations: UC Davis Arboretum - Davis, CA, Cal Poly State University - San Luis Obispo, CA, San Francisco, CA, Milpitas, CA and Santa Barbara, CA
Grows best in light, well-drained, fertile soil. A timber species in Australia.
Cal-IPC (California Invasive Plant Council) classifies the invasiveness of this plant as limited.
Native to Eastern Australia.
An Acacia melanoxylon in Hayward is registered as a California Big Tree. It measures 62 feet high, with a trunk circumference of 115 inches and a crown spread of 77 feet.
Additional Common Names
BLACKWOOD ACACIA, BLACK ACACIA, SALLY WATTLE
Erect or Spreading with a High Canopy.
Conical or Rounded Shape.
Has Evergreen foliage.
Height: 40 - 50 feet.
Width: 20 feet.
Growth Rate: 36 or More Inches per Year.
Longevity 50 to 150 years.
Leaves Oblanceolate, Gray Green or Dark Green, No Change, Evergreen.
Flowers Showy. Cream or White. Flowers in Spring or Winter. Has perfect flowers (male and female parts in each flower).
Brown or Purple Pod, Very Large (Over 3.00 inches), fruiting in Winter or Summer.
Bark Black or Dark Brown, Fissured.
Shading Capacity Rated as Dense in Leaf.
Litter Issue is Dry Fruit.
Tree Site Conditions & Constraints
Sunset Zones 8, 9 and 13 - 24.
USDA Hardiness Zones 9 - 11.
Exposure Full Sun to Partial Shade.
Wet to Dry Soil.
Loam or Sand Texture.
Slightly Acidic to Highly Alkaline Soil pH.
Salinity Tolerance is Good Inland.
Seaside Tolerance is Good in Mild Zone.
Pests & Disease Information
Susceptible to Beetle Borers and Thrip, Phytophthora and Root Rot.
Health, Safety & Environmental Concerns
Branch Strength Rated as Weak.
Root Damage Potential Rated as High.
Allergy Health Hazard.
Biogenic Emissions considered Moderate.
Not Deer Palatable.
Special Uses & Values
Cite this tree:
SelecTree. "Acacia melanoxylon Tree Record." 1995-2018. Apr 23, 2018.
< https://selectree.calpoly.edu/tree-detail/acacia-melanoxylon >
SelecTree Nursery Connection Map
Cal Poly / ESRI