How to Grow Native Hawaiian Ohia

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Native Hawaiian Ohia

Metrosideros polymorpha

tree

Metrosideros polymorpha, commonly known as ohia or ohia lehua, is an endemic Hawaiian tree species that produces distinctive crimson, orange, or yellow brush-like flowers. It is a keystone species in Hawaiian ecosystems, particularly important at higher elevations where it often forms the primary forest canopy. The tree can range from a shrubby form in exposed areas to a tall forest tree reaching 80+ feet.

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

Plant Native Hawaiian Ohia
Around Apr 17

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

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

Before the first fall frost (≈ Nov 8)

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

Growing Conditions

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

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Water: Moderate water needs; drought-tolerant once established. Prefers consistent moisture during establishment and growing season but is adapted to variable rainfall. Avoid waterlogging.

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Spacing: 60-120 (varies by intended form; seedlings spaced based on final size) inches

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Days to maturity: 3-5 years for flowering from nursery stock; 7-10 years from seed

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Planting depth: Surface sow seeds with light covering of soil; plant nursery stock at same depth as root ball

Soil

Type: Well-draining volcanic or sandy loam soil

pH: 5.0-7.0

Amendments:

Organic compost or mulch Perlite or coarse sand for drainage Volcanic rock or pumice

Growing Zones

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Thrives in USDA zones 10b-12, primarily in Hawaii and warm tropical climates

10b 11a 11b 12a 12b

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Growth Stages

Seed Germination

2-4 weeks

Tiny seeds germinate to produce small seedlings with oval cotyledons and early true leaves

Keep soil consistently moist but not waterlogged; provide bright indirect light; maintain warm temperatures (70-80°F); seeds have variable germination rates

Seedling Establishment

2-4 months

Young plants develop several sets of true leaves and establish root systems; growth is relatively slow

Provide bright, filtered light; maintain moderate moisture; protect from strong winds; fertilize lightly with balanced fertilizer every 4-6 weeks

Vegetative Growth

1-2 years

Plant increases in height and develops a branching structure; foliage is lush green with leathery, opposite leaves

Gradually acclimate to full sun if desired; water during dry periods; prune to shape if needed; fertilize monthly during growing season

Pre-flowering

Several months before flowering

Plant begins producing flower buds at branch tips; terminal leaf clusters become more pronounced

Maintain consistent care; ensure adequate sunlight for flower initiation; reduce nitrogen-heavy fertilizer to promote blooming; monitor for pests

Flowering and Fruiting

Flowering sporadic to continuous depending on location; 6-8 months for fruit maturation

Produces characteristic crimson, orange, or yellow pom-pom-like flowers; flowers mature into small woody capsules containing numerous seeds

Do not deadhead if seed collection is desired; maintain moderate watering; flowers attract native Hawaiian birds (especially apapane); seeds mature 6-8 months after flowering

Companion Planting

Plan your garden →

Plant with:

Silversword (Argyroxiphium) Mamane (Sophora chrysophylla) Sandalwood (Santalum) Native Hawaiian ferns Naupaka (Scaevola) Hawaiian honeycreeper-attracting plants

Avoid planting near:

Invasive species like strawberry guava Fountain grass (Pennisetum) Aggressive nitrogen-fixing plants in conservation contexts Lantana

Common Pests

Spray with horticultural oil; prune heavily infested branches; introduce natural predators; avoid over-fertilizing with nitrogen
No cure; prevention is key—ensure well-draining soil, avoid waterlogging, sanitize tools, remove infected trees, maintain tree vigor, use disease-resistant seedlines when available
Generally not severely damaging; tolerate minor damage; spray with neem oil if severe; encourage natural predators
Improve air circulation; avoid overhead watering; spray with sulfur or horticultural oil if necessary; less common in ideal growing conditions
Ensure excellent drainage; avoid waterlogging; use well-draining soil amendments; remove affected plants; sterilize soil before replanting

Uses

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Hawaiian Native Pollinator and Bird Support

Wildlife

Ohia is a critical food source for native Hawaiian honeycreepers, particularly the apapane, which feeds on its nectar and insects in the flowers. The tree is essential for maintaining populations of Hawaii's endemic forest birds and supports the broader native ecosystem. [source]

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Cultural and Spiritual Significance

Cultural

Ohia holds deep cultural importance in Hawaiian traditions and is associated with Pele, the volcano goddess. The flowers (lehua) are used in lei and have been central to Hawaiian culture for centuries. [source]

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Lei and Floral Arrangements

Household

The striking flowers are prized for traditional lei-making and ornamental arrangements. The blooms are long-lasting in arrangements and symbolize prosperity and good fortune in Hawaiian tradition. [source]

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Traditional Hawaiian Medicine

Medicinal

Ohia bark and leaves have been used in traditional Hawaiian medicine for various ailments including respiratory issues and general wellness. Modern research is exploring bioactive compounds in the plant. [source]

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Watershed and Ecosystem Restoration

Environmental

Ohia is a keystone species for Hawaiian watershed protection and forest restoration. It stabilizes soil, supports water infiltration, and is central to reforestation efforts in Hawaii's native forest ecosystems. [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: Collect mature seed capsules 6-8 months after flowering when they begin to dry and split open. Spread collected capsules in a warm, dry location to fully dry and release seeds. For ornamental purposes, enjoy flowers year-round depending on growing conditions; no traditional 'harvesting' but you may collect flowers for arrangement or propagation.

Fun Facts

🌱 Ohia is the only tree species that naturally grows at all elevations across Hawaii's islands, from sea level to over 10,000 feet on Mauna Kea, making it an incredibly adaptable species.
🌱 The tree's flower color varies by location and genetics—crimson is most common, but orange, yellow, and rarely white flowers occur, leading to the poetic name 'lehua' meaning 'sacred flower'.
🌱 In Hawaiian legend, picking ohia blossoms is said to bring rain and bad luck unless you leave an offering; this tradition may have roots in ecological importance, as the flowers sustain native bird populations critical to forest health.

Gardening Terms

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

Deadhead Full Sun Germination Partial Shade pH True Leaves

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