SelecTree: Tree Detail
Photo Locations: Cal Poly State University - San Luis Obispo, CA
Valued for its strong, hard wood and used commercially in various applications. Young leaves are feathery and divided, developing into single, curved, leathery lanceolate shape. These mature 'leaves' are actually phyllodes. Koa is considered a large tree and will grow to over 90 feet tall and wide in its native range.
Native to Hawaii.
Erect or Spreading with a High Canopy.
Conical or Rounded Shape.
Has Evergreen foliage.
Height: 40 - 60 feet.
Width: 30 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 to Yellow. Flowers in Spring or Summer. 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 Moderately Dense in Leaf.
Litter Issue is Dry Fruit.
Tree Site Conditions & Constraints
Sunset Zones H1, H2.
USDA Hardiness Zones 9 - 11.
Exposure Full Sun to Partial Shade.
Wet to Dry Soil.
Loam or Sand Texture.
Acidic / Neutral Soil pH.
Salinity Tolerance is Good Inland.
Seaside Tolerance is Good in Mild Zone.
Pests & Disease Information
Susceptible to Invasive Shot Hole Borer, 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 koa Tree Record." 1995-2018. Aug 15, 2018.
< https://selectree.calpoly.edu/tree-detail/acacia-koa >