SelecTree: Tree Detail

SMOOTH-SHELL MACADAMIA
Macadamia integrifolia

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Photo Locations: Kona and Oahu, HI, Los Angeles County Arboretum - Arcadia, CA, Quail Arboretum, CA, Huntington Botanical Gardens - San Marino, CA and Cal Poly Campus - San Luis Obispo, CA

General Notes

Macadamia is the only Australian species to be domesticated and become an important food crop. The commercial macadamia nut industry was developed in Hawaii and production still happens on the Islands. The smooth-shell macadamia was a source of food for aborigines in tropical northeastern Australia for millennia, and was introduced to Hawaii in the early 1800s. These trees are often grown in home gardens, for shade, nuts, and the sweetly smelling flowers, and rarely in municipalities as park or street trees. They are relatively drought tolerant and grow well near the coast. Macadamia integrifolia has a HPWRA (Hawai'i Pacific Weed Risk Assessment) score of -1 (Low Risk).

Native to Eastern Australia.

Family: Proteaceae

Additional Common Names

SMOOTH-SHELL MACADAMIA, QUEENSLAND NUT

Tree Characteristics

Erect or Spreading with a Low Canopy.

Rounded, Spreading or Vase Shape.

Has Evergreen foliage.

Height: 30 - 40 feet.

Width: 20 - 30 feet.

Growth Rate: 24 Inches per Year.

Longevity 50 to 150 years.

Leaves Oblong, Dark Green, No Change, Evergreen.

Flowers Showy. Pink or White. Flowers in Spring or Winter.

Beige or Brown Nut, Medium (0.50 - 1.50 inches), fruiting in Fall Edible and Wildlife use it.

Bark Light Green, Rough.

Shading Capacity Rated as Dense in Leaf.

Litter Issue is Dry Fruit.

Tree Site Conditions & Constraints

Sunset Zones 9, 16 - 17 and 19 - 24; H1, H2.

USDA Hardiness Zones 9 - 11.

Exposure Full Sun.

Moist Soil.

Drought tolerant.

Loam or Sand Texture.

Slightly Acidic to Slightly Alkaline Soil pH.

Seaside Tolerance is Good in Mild Zone.

Pests & Disease Information

Resistant to Armillaria. Susceptible to Crown Rot, Phytophthora and Root Rot.

Health, Safety & Environmental Concerns

Branch Strength Rated as Medium.

Root Damage Potential Rated as Moderate.

None Known Health Hazard.

Desirable Wildlife Plant.

Attracts Squirrels.

Wildlife use Fruit.

Special Uses & Values

Screen.

Cite this tree:
SelecTree. "Macadamia integrifolia Tree Record." 1995-2020. Aug 14, 2020.
< https://selectree.calpoly.edu/tree-detail/macadamia-integrifolia >

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.