How to Grow 'Ōhi'a lehua

iNaturalist

'Ōhi'a lehua

Metrosideros polymorpha

tree

'Ōhi'a lehua is a native Hawaiian tree known for its stunning clusters of bright red, pink, orange, or yellow flowers that resemble pompoms. It is a keystone species in Hawaiian ecosystems, providing food and habitat for native birds, and plays a culturally significant role in Hawaiian traditions. The tree is highly variable in form, ranging from low shrubs to tall forest canopy trees depending on elevation and environment.

When should you plant 'Ōhi'a lehua in your zone?

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Example 'Ōhi'a lehua timeline · Pittsburgh, PA (Zone 6b)

Plant 'Ōhi'a lehua
Around Apr 17

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

Watering, feeding, and pest-watch reminders.
Harvest 'Ōhi'a lehua
Late summer into fall

Before the first fall frost (≈ Nov 8)

Sample dates for Pittsburgh, PA. Sign up to get exact 'Ōhi'a lehua dates for your own zip code.

Growing Conditions

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Sun: Full sun to partial shade; 6+ hours of direct sunlight daily for optimal flowering

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Water: Moderate watering; drought-tolerant once established, but prefers consistent moisture during growth and flowering. Reduce watering in winter. Sensitive to waterlogged conditions.

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Spacing: 120-240 inches

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Days to maturity: 2-4 years before significant flowering (3-5 years for full maturity)

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Planting depth: Plant nursery transplants at soil line; seeds require stratification and germinate in 3-6 weeks

Soil

Type: Well-draining volcanic or slightly acidic soil; tolerates poor, rocky, or lava-derived soils

pH: 5.5-7.0

Amendments:

Organic compost Perlite or pumice for drainage Mulch to retain moisture and regulate temperature

Growing Zones

Find your zone →

Thrives in USDA zones 10-12; best suited to Hawaiian islands and tropical/subtropical climates

10a 10b 11a 11b 12a 12b

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Growth Stages

Seedling

4-8 weeks

Small tender shoots with paired oval leaves; fragile and requires protection

Keep soil consistently moist but not waterlogged; provide 50-70% shade; use sterile seed-starting mix; protect from strong winds and direct sun

Juvenile

6-18 months

Establishes main stem and branch structure; leaves develop characteristic form; slow initial growth

Gradually increase light exposure; maintain regular watering; stake for support if needed; prune to encourage bushier form; apply balanced fertilizer monthly during growing season

Vegetative Growth

1-2 years

Vigorous shoot elongation and canopy development; dense branching; dark green foliage

Continue regular watering; apply slow-release fertilizer; prune crossing or crowded branches; mulch to conserve moisture; watch for pests

Flowering

4-8 weeks per bloom cycle; multiple cycles per year possible

Clusters of terminal flowers appear in vibrant red, pink, orange, or yellow; flowers have prominent stamens giving pompom-like appearance

Ensure consistent moisture and adequate light; reduce nitrogen to encourage flowering; minimal pruning; do not deadhead if seeds are desired; provide shelter from strong winds that damage flowers

Fruiting & Maturity

Ongoing in established trees

Small dry capsular fruits develop; seeds are tiny and numerous; mature trees develop thick bark and substantial canopy

Allow seed pods to mature naturally for self-seeding if desired; collect pods before they dehisce; mature trees are largely self-sufficient; continue monitoring for pests

Companion Planting

Plan your garden →

Plant with:

Native Hawaiian ferns Koa 'Ōkelo (Hawaiian raspberry) Myrtle Native Hawaiian sandalwood Naupaka Pukiawe

Avoid planting near:

Aggressive invasive grasses (fountain grass, broomsedge) Albizia (mimosa) — spreads rapidly and outcompetes natives Argentine ant colonies — harm native insects 'ōhi'a depends on

Common Pests

No cure exists; prevention is critical. Sterilize pruning tools with 70% alcohol between cuts; avoid wounding trees; control ambrosia beetle vectors with careful sanitation; do not transport infected plant material; report suspected infections to state agriculture authorities
Maintain tree vigor with proper watering and minimal stress; remove infested branches promptly; sterilize tools; avoid bark damage; no effective pesticide treatment; beetles spread ROD fungus
Improve air circulation through selective pruning; avoid overhead watering; apply sulfur dust or neem oil if needed; resistant cultivars preferred
Spray with horticultural oil during dormant season; prune heavily infested branches; encourage natural predators
Spray foliage with water to dislodge; maintain adequate humidity; use miticide if severe; avoid high-nitrogen fertilizer

Uses

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Hawaiian Lei & Sacred Symbolism

Cultural

'Ōhi'a lehua holds deep spiritual significance in Hawaiian culture; flowers are woven into traditional lei and used in ceremonies. The tree is protected in Hawaiian tradition and planting one is considered a blessing. [source]

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Native Bird Habitat & Nectar

Wildlife

The flowers provide essential nectar for native Hawaiian honeycreepers including the 'amakihi and apapane, which are critically important pollinators and seed dispersers in Hawaiian ecosystems. [source]

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Traditional Hawaiian Medicine

Medicinal

Bark, leaves, and flowers have been used traditionally in Hawaiian medicine for treating various ailments; contains compounds with potential anti-inflammatory properties. [source]

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Landscape & Ornamental Value

Household

'Ōhi'a lehua serves as a stunning ornamental tree in tropical and subtropical gardens, offering year-round foliage and periodic vibrant blooms; cultivars with different flower colors are available. [source]

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Hawaiian Forest Restoration

Ecological

Planting 'ōhi'a lehua is central to Hawaiian native forest restoration efforts; the tree helps rebuild degraded ecosystems and provides habitat for endangered species. [source]

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

Harvest Tips

Seeds can be collected from mature dry capsules in late summer to fall; allow pods to fully dry on the tree before collection; store seeds in cool, dry conditions. Flowers are traditionally harvested by hand for lei-making; pick in early morning when blooms are freshest. No fruit harvesting needed for ornamental or cultural use.

Fun Facts

🌱 'Ōhi'a lehua is so variable that early botanists thought different forms were separate species; it can range from a low, spreading shrub at high elevations (like on Maui's Haleakalā) to a towering 100+ foot tree in lowland forests.
🌱 The tree's scientific name, Metrosideros polymorpha, literally means 'many-forming,' reflecting its remarkable polymorphism across different Hawaiian island habitats.
🌱 Rapid 'Ōhi'a Death (ROD) is currently devastating 'ōhi'a populations in Hawai'i; thousands of acres have been killed since the disease emerged, making conservation and disease-resistant cultivation critical for the species' survival.

Gardening Terms

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

Deadhead Full Sun Mulch Partial Shade

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