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Proteaceae TREE OUTDOOR Placement Primary: Food Ornamental

Macadamia Nut Tree

Macadamia integrifolia

Identified By Marcs

The Macadamia nut tree is an evergreen tree native to the rainforests of northeastern Australia, prized globally for its rich, buttery edible nuts and glossy, dark green foliage. Growing quite large, it thrives in warm, frost-free subtropical and tropical climates with well-draining soils and ample rainfall. The tree produces delicate sprays of fragrant cream or pinkish flowers that eventually develop into hard woody spherical follicles enclosing the coveted high-fat kernels. Cultivating macadamia trees requires patience as they take several years to bear fruit, but they reward growers with delicious and nutrient-dense harvests for decades when properly cared for in ideal environments.

Also known as: Queensland Nut Bush Nut Maroochi Nut Bauple Nut

Toxicity & Safety

Is Macadamia Nut Tree toxic to pets?

Yes, toxic to pets.

Macadamia nuts are known to be severely toxic to dogs, causing a condition known as macadamia nut toxicosis. Ingestion can lead to symptoms such as weakness, depression, vomiting, tremors, hyperthermia, and ataxia within twelve hours of consumption. Although most dogs recover fully within 24 to 48 hours with supportive veterinary care, pet owners must ensure that dogs are strictly kept away from both the raw and roasted nuts as well as any baked goods containing macadamia ingredients.

Is Macadamia Nut Tree toxic to humans?

No, Macadamia Nut Tree is generally safe for humans.

Is Macadamia Nut Tree safe during pregnancy?

Generally considered safe during pregnancy.

Growth & Dimensions

Height 200 - 1500 cm
Width 200 - 1000 cm
Growth Rate Moderate
Care Level Moderate
Lifespan Perennial

Ideal Environment

Temperature 10°C - 35°C
Sunlight Hours 6 - 10 hrs/day
Sun Exposure Full sun
Soil pH 5 - 6.5
Watering Interval 7 - 14 days
Humidity 50.00% - 80.00%
USDA Zone 9b - 11

Subtropical and Tropical Coastal Regions

Climate: Thrives in warm, frost-free climates with high relative humidity and reliable rainfall spread throughout the year.

Soils: Loam Sandy Loam Volcanic Soil
Annual Rainfall: 1000 - 2500 mm

Native Regions

Eastern Australia

How to Care for Macadamia Nut Tree

How should I handle watering your macadamia tree?

Water young macadamia trees regularly to establish a deep root system, ensuring the soil stays evenly moist but never waterlogged. Mature trees are moderately drought tolerant but require consistent moisture during the nut development season to prevent premature drop and ensure optimal kernel filling.

How should I handle sunlight and location?

Plant your macadamia tree in a location that receives full sun exposure for at least six to eight hours every day. Adequate sunlight is crucial for maximizing flower production, which directly correlates with a successful and abundant yearly nut harvest.

How should I handle soil and fertilization?

Ensure the planting site has deep, fertile, and well-draining soil with an acidic to slightly acidic pH level between 5.0 and 6.5. Apply a specialized, low-phosphorus fertilizer formulated for Australian native plants in early spring to support healthy growth without causing nutrient toxicity.

How to Propagate Macadamia Nut Tree

How to propagate Macadamia Nut Tree by grafting?

Propagation of superior macadamia cultivars is primarily achieved through grafting scion wood onto robust rootstock seedlings. Select healthy rootstock seedlings that are approximately pencil-thick, usually around one year of age. Use a whip and tongue or wedge graft technique in spring when sap flow is active. Ensure the cambium layers of the scion and rootstock align precisely, secure the graft union tightly with grafting tape, and place the newly grafted plant in a humid greenhouse or under plastic protection until the union heals and new shoots emerge.

Common Diseases & Pests of Macadamia Nut Tree

What is Phytophthora Root Rot and how is it treated?

Fungal
Symptoms:

Infected trees exhibit gradual canopy thinning, yellowing leaves, branch dieback, and dark lesions on the lower trunk near the soil line. The root system shows severe decay with brown, dead feeder roots that fail to absorb water effectively.

Treatment:

Improve site drainage immediately and apply targeted systemic fungicides approved for phytophthora management around the root zone according to label instructions. Severely infected trees may need to be removed to prevent spread.

Prevention:

Plant trees in well-drained soil mounds, avoid overwatering, and ensure that mulch is kept several centimeters away from direct contact with the main trunk of the tree to deter fungal pathogens.

Properties & Benefits of Macadamia Nut Tree

Bears Fruit

Uses & Health Benefits

What are the benefits of heart health support in Macadamia Nut Tree?

Macadamia nuts are exceptionally rich in monounsaturated fatty acids, particularly palmitoleic acid and oleic acid, which help maintain healthy cholesterol profiles by lowering LDL cholesterol levels. Incorporating these nutrient-dense nuts into a balanced diet can support overall cardiovascular health, reduce systemic inflammation, and decrease the risk of developing heart disease over time.

Precautions: Due to their high calorie and fat content, macadamia nuts should be consumed in moderation as part of a calorie-controlled diet.

Key Nutrients / Compounds

Manganese rich in 4.1 mg / 100g
Healthy Monounsaturated Fats rich in 75.8g / 100g
Thiamine (Vitamin B1) high 1.2 mg / 100g

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