How to Grow Macadamia Keauhou
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Macadamia Keauhou
Macadamia integrifolia
treeMacadamia Keauhou is a cultivar of the macadamia nut tree, prized for its large, flavorful nuts and relatively compact growth habit. This evergreen tropical tree produces creamy, buttery nuts enclosed in a hard shell, making it a premium commercial and ornamental crop. The Keauhou variety is known for good productivity and nut quality, adapted to Hawaiian growing conditions.
When should you plant Macadamia Keauhou in your zone?
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Example Macadamia Keauhou timeline · Pittsburgh, PA (Zone 6b)
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Plant Macadamia Keauhou
Around Apr 17Near Pittsburgh's average last spring frost.
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Tend & protect
Late spring–summerWatering, feeding, and pest-watch reminders.
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Harvest Macadamia Keauhou
Late summer into fallBefore the first fall frost (≈ Nov 8)
Sample dates for Pittsburgh, PA. Sign up to get exact Macadamia Keauhou dates for your own zip code.
Growing Conditions
Soil
Growing Zones
Find your zone →Thrives in zones 10-11; requires tropical to subtropical climates without frost
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Get my Macadamia Keauhou timeline →Growth Stages
Establishment
1-2 yearsYoung nursery tree (1-2 years old) with developing root system and establishing canopy
Plant in spring or early summer; maintain consistent moisture without waterlogging; stake if needed in windy locations; prune competing leaders to establish single strong trunk
Vegetative Growth
2-4 yearsTree develops branching structure and foliage; rapid height and width increase
Apply mulch (3-4 inches) around base; fertilize every 6-8 weeks with balanced formula; light pruning to shape canopy; monitor for wind damage in exposed sites
Flowering
4-8 weeksSmall, delicate flowers appear in late winter to early spring in dense panicles along branches
Maintain adequate potassium and boron; avoid heavy pruning during flowering; provide consistent watering to support fruit set; temperatures below 60°F may reduce flower set
Fruit Development
6-12 monthsRound, hard-shelled drupes develop over 6-12 months; nuts enlarge and kernel fills the shell
Thin heavily loaded branches to prevent breakage; maintain deep watering schedule; apply nitrogen and potassium fertilizer; ensure adequate calcium to prevent shell hardening defects
Maturation & Harvest
Varies; harvest season typically September-January in HawaiiNuts mature and drop to ground naturally when ripe; kernel is fully developed and creamy
Begin harvesting when nuts fall; collect promptly to prevent mold; dry nuts in shade for 2-4 weeks; crack open with macadamia cracker once fully cured
Companion Planting
Plan your garden →Plant with:
Avoid planting near:
Common Pests
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Monitor for white waxy coating on twigs; apply horticultural oil or neem oil; prune heavily infested branches; avoid excessive nitrogen which promotes soft growth
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Remove and burn infested twigs; maintain tree health and vigor; apply sticky bands to trunk; avoid wounding the tree
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Use tree guards on trunk; install predator-proof fencing; remove dropped nuts promptly; use traps or live removal if necessary
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Spray with horticultural oil during dormant season; use insecticidal soap for active infestations; improve tree vigor and air circulation
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Ensure excellent drainage; avoid overwatering; apply fungicide drenches if detected; remove severely affected trees
Uses
Premium nut butter and snack
CulinaryMacadamia nuts are prized for their rich, creamy texture and buttery flavor. They are eaten raw, roasted, salted, or processed into macadamia nut butter, which is used in baking, cooking, and as a gourmet spread. [source]
Macadamia oil extraction
CulinaryCold-pressed macadamia oil is a premium cooking oil with a high smoke point and rich flavor, used in fine dining for sautéing, roasting, and finishing dishes. [source]
Cosmetics and skincare
HouseholdMacadamia nut oil is rich in monounsaturated fatty acids and vitamin E, making it a prized ingredient in high-end skincare products, lotions, and hair conditioners for its moisturizing and anti-inflammatory properties. [source]
Heart-healthy dietary supplement
MedicinalMacadamia nuts are rich in monounsaturated fats and have been studied for their cardiovascular benefits, helping to reduce cholesterol levels and support heart health. [source]
Habitat and food for native birds
WildlifeMature macadamia trees provide shelter and foliage for native Hawaiian bird species and can support beneficial insects and pollinators in tropical agroforestry systems. [source]
This is not medical advice. LizPlants is not a medical resource. Always consult a qualified healthcare professional before using plants medicinally.
Harvest Tips
Macadamia nuts mature and drop naturally to the ground 6-12 months after flowering. Harvest fallen nuts daily to prevent mold and rancidity. Dry nuts in a warm, airy location (not in direct sun) for 2-4 weeks until the kernel is brittle and dry (moisture content below 1.5%). Crack the extremely hard shell using a specialized macadamia cracker or vise. Commercial cracking requires mechanical equipment. Store dried nuts in cool, dry conditions; refrigerate or freeze shelled kernels to preserve freshness for several months.
Fun Facts
- 🌱 Macadamia nuts have the hardest shell of any nut tree, requiring 300 pounds of pressure per square inch to crack—they were originally cracked using hammer and anvil before mechanical crackers were invented.
- 🌱 The Keauhou variety was developed in Hawaii and is named after the Keauhou district on the Big Island, reflecting its adaptation to Hawaiian volcanic soils and tropical climate.
- 🌱 A mature macadamia tree can produce 20-40 pounds of nuts annually and can remain productive for 40+ years, with some trees living over 100 years.
Gardening Terms
New to gardening? Learn about terms used in this guide:
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