How to Grow Hawaiian Ohia

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Hawaiian Ohia

Metrosideros polymorpha

tree

The Hawaiian Ohia is a versatile native tree endemic to Hawaii, ranging from a small shrub to a tall canopy tree depending on elevation and growing conditions. It produces distinctive leathery leaves and striking red (occasionally yellow or orange) brush-like flowers that are highly attractive to native Hawaiian birds. The tree is culturally significant to Hawaiian traditions and plays a crucial ecological role in Hawaiian forests.

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Example Hawaiian Ohia timeline · Pittsburgh, PA (Zone 6b)

Plant Hawaiian Ohia
Around Apr 17

Near Pittsburgh's average last spring frost.
Tend & protect
Late spring–summer

Watering, feeding, and pest-watch reminders.
Harvest Hawaiian Ohia
Late summer into fall

Before the first fall frost (≈ Nov 8)

Sample dates for Pittsburgh, PA. Sign up to get exact Hawaiian Ohia dates for your own zip code.

Growing Conditions

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Sun: Full sun to partial shade; performs best with 6+ hours of direct sunlight daily

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Water: Moderate to high water needs; prefers consistent moisture but well-draining soil. Tolerates both wet and dry conditions once established. In cultivation, water regularly during establishment and dry seasons.

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Spacing: 120 inches

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Days to maturity: 3-5 years to flowering; mature tree at 10-15 years

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Planting depth: Plant at same depth as nursery container; seeds surface-sown or just barely covered

Soil

Type: Well-draining volcanic or loamy soil; tolerates poor, acidic soils

pH: 5.5-6.5

Amendments:

Peat moss for moisture retention in drier conditions Aged compost for nutrient boost Volcanic rock or pumice for drainage

Growing Zones

Find your zone →

Thrives in USDA zones 10b-12; best in warm, humid tropical climates

10b 11a 11b 12a 12b

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Growth Stages

Seedling

4-8 weeks

Tiny green shoots emerge; develops first true leaves that are small, narrow, and dark green

Keep soil consistently moist but not waterlogged. Provide bright, indirect light. Maintain warmth (70-80°F). Protect from strong winds and transplant shock.

Establishment

1-2 years

Young tree develops deeper root system and stronger stem; reaches 1-3 feet tall with increasing leaf density

Water regularly during dry periods. Provide stake support in windy locations. Begin light pruning to shape. Mulch around base to retain moisture and moderate soil temperature.

Vegetative Growth

1-2 years

Tree grows steadily, developing full canopy structure; dense, dark green foliage covers most of the crown

Continue regular watering, especially in dry seasons. Prune to maintain desired shape and remove dead/crossing branches. Thin canopy if needed for light penetration.

Flowering

Several months, often spring; may flower multiple times yearly

Red, yellow, or orange pom-pom-like flowers appear at branch tips, clustering densely along outer canopy

Reduce nitrogen fertilizer to encourage blooming. Maintain consistent moisture. Do not prune heavily during flowering. Enjoy native bird visitors (especially Hawaiian honeycreepers).

Fruiting & Maturity

Ongoing; seeds mature 4-6 months after flowering

Small woody capsules develop where flowers were; tree reaches full size (20-40+ feet tall depending on variety/conditions)

Allow seeds to mature and dry on tree if you want self-seeding. Collect seed capsules for propagation if desired. Minimal maintenance needed for established mature trees.

Companion Planting

Plan your garden →

Plant with:

Native Hawaiian ferns Ohia lehua understory plants Native Hawaiian shrubs (Naupaka, Ilima) Native Hawaiian vines Koa trees (in same ecosystem context)

Avoid planting near:

Plants requiring consistently dry conditions Plants sensitive to acidic soil Shallow-rooted ornamentals that compete for space

Common Pests

Quarantine infected plants; remove affected foliage; improve air circulation; avoid overhead watering; no chemical cure; resistant varieties are being developed
Remove and destroy infested galls; prune heavily affected branches; maintain tree vigor through proper care; monitor regularly
Spray with horticultural oil or insecticidal soap; encourage natural predators; remove heavily infested branches
Improve air circulation; avoid overhead watering; apply sulfur dust or neem oil if needed; remove affected leaves

Uses

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Sacred Hawaiian Cultural Significance

Cultural

The Ohia tree is deeply sacred in Hawaiian culture and tradition, often associated with the volcano goddess Pele. It holds profound spiritual and cultural importance to Native Hawaiians. [source]

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Native Bird Support & Nectar

Wildlife

The abundant red flowers are a primary nectar source for Hawaiian honeycreepers and native birds. The tree's blooming cycles support critical bird populations and maintain ecological balance in Hawaiian forests. [source]

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Traditional Hawaiian Medicine

Medicinal

Historically used in Hawaiian traditional medicine (Lāʻau Lapaʻau) for various ailments; bark and leaves were used for preparations and remedies by Native Hawaiians. [source]

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Timber & Woodcraft

Household

Provides durable, attractive hardwood traditionally used for Hawaiian crafts, tools, and small furnishings; the hard wood is valuable for specialized applications. [source]

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Rainforest Reforestation & Conservation

Ecological

Critical species for restoring Hawaiian native forests and preventing erosion; plays a foundational ecological role in high-elevation and wet forest ecosystems across the Hawaiian islands. [source]

This is not medical advice. LizPlants is not a medical resource. Always consult a qualified healthcare professional before using plants medicinally.

Harvest Tips

For seed collection, gather mature brown seed capsules when dry (4-6 months after flowering); open capsules to extract tiny winged seeds; dry seeds thoroughly before storage. No fruit or wood harvest is typical for cultivated ornamental trees. Flowers can be enjoyed on the living tree; cut flowers have short vase life.

Fun Facts

🌱 Metrosideros polymorpha is remarkably polymorphic, meaning the same species can range from a low creeping shrub in harsh windswept summit environments to a towering 60+ foot canopy tree in lush forests—this is one of the most extreme variations within a single tree species.
🌱 The Ohia's flowers display striking color variations (red, yellow, or orange) across different islands and elevations; some individual trees even produce multiple flower colors, and these variations may be genetically influenced.
🌱 The species is now threatened by Ohia rust (Puccinia psidii), a fungal pathogen that has caused dramatic die-offs in some Hawaiian forests; conservation efforts and resistant-variety research are ongoing to protect this culturally and ecologically vital tree.

Gardening Terms

New to gardening? Learn about terms used in this guide:

Crown Full Sun Mulch Partial Shade Transplant True Leaves

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