SelecTree: Tree Detail

KOA
Acacia koa

Acacia koa Acacia koa Acacia koa Acacia koa Acacia koa Acacia koa Acacia koa Acacia koa Acacia koa Acacia koa

Photo Locations: Cal Poly State University - San Luis Obispo, CA

General Notes

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.

Family: Fabaceae

Synonyms

Acacia kauaiensis
Racosperma kauaiense

Tree Characteristics

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.

Drought tolerant.

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 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.

Attracts Birds.

Not Deer Palatable.

Special Uses & Values

Pollarding.

Cite this tree:
SelecTree. "Acacia koa Tree Record." 1995-2017. Sep 21, 2017.
< http://selectree.calpoly.edu/tree-detail/acacia-koa >

This tree is not part of the SelecTree Nursery Connection. If you would like to see this tree listed, or know of a nursery that sells it, please contact us at ufei@calpoly.edu.