How to Grow Native Hawaiian ʻŌhiʻa

Native Hawaiian ʻŌhiʻa

Metrosideros polymorpha

tree

ʻŌhiʻa is a native Hawaiian tree species that can grow from a low shrub to a towering canopy tree, typically reaching 30-80 feet in height depending on growing conditions. It is characterized by its striking bright red, crimson, or occasionally yellow-orange flowers that bloom in dense clusters, attracting native Hawaiian birds like the ʻIʻiwi and ʻAmakihi. The tree is ecologically vital to Hawaiian forests and is culturally significant in Hawaiian traditions.

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

Plant Native Hawaiian ʻŌhiʻa
Around Apr 17

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

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

Before the first fall frost (≈ Nov 8)

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

Growing Conditions

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Sun: Full sun to partial shade, 6+ hours of direct sunlight daily; tolerates shade but flowers more profusely in full sun

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Water: Moderate water requirements; prefers consistent moisture but is drought-tolerant once established. In wet habitats, it tolerates poor drainage; in drier areas, ensure regular watering during establishment and dry periods

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Spacing: 240 inches

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Days to maturity: 3-5 years to flowering (from seed or small nursery stock)

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Planting depth: Plant nursery trees at the same depth as the root ball; seeds should be surface-sown or barely covered (1/8 inch)

Soil

Type: Well-draining volcanic or sandy loam soil with organic matter

pH: 5.5-7.0

Amendments:

Compost or aged bark mulch Perlite or coarse sand for drainage Organic matter to retain moisture without waterlogging

Growing Zones

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

10b 11a 11b 12a 12b

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Growth Stages

Seedling

4-8 weeks

Tiny seedlings with 2-4 small leaves emerge slowly. Growth is initially very slow, with delicate foliage

Maintain high humidity and consistent moisture. Provide bright, indirect light. Protect from direct sun and strong winds. Keep soil consistently moist but not waterlogged. Thin seedlings if crowded

Juvenile

1-3 years

Young plants develop multiple stems and leaves, growing slowly over 1-3 years. Foliage is typically oblong and waxy, and the plant may appear shrubby

Transplant to larger containers or in-ground when roots establish (6-12 months). Gradually acclimate to full sun. Water regularly during dry periods. Mulch around the base to conserve moisture and regulate temperature. Prune only to shape if needed

Vegetative Growth

1-3 years after planting

The tree establishes a strong root system and develops a fuller canopy structure. Rapid height gain occurs in favorable conditions

Continue regular watering during establishment (first 1-2 years). Maintain mulch layer. Support young trees with staking if in windy areas. Fertilize lightly with balanced or slow-release fertilizer in spring if in poor soil. Prune lower branches as the tree grows if desired

Flowering & Reproduction

3-6 months (flowering period), repeating annually after maturity

Dense clusters of bright red (occasionally yellow or orange) flowers appear, typically in spring and summer. Flowers attract native Hawaiian birds and pollinators

Ensure adequate sunlight for optimal flower production. Maintain consistent watering; drought stress may reduce flowering. No deadheading needed unless maintaining ornamental form. Flowers are followed by small woody capsules containing tiny seeds

Mature Tree

Indefinite (can live 100+ years)

Established trees can reach 30-80+ feet with a broad, dense canopy. Annual flowering cycles occur reliably in favorable conditions

Minimal water supplementation needed in areas with adequate rainfall; water during extended dry periods. Prune only for safety, shape, or disease management. Monitor for pests and diseases. ʻŌhiʻa is susceptible to Rapid ʻŌhiʻa Death (ROD) fungus in some areas—ensure good air circulation and avoid planting in waterlogged soils

Companion Planting

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Plant with:

ʻAʻaliʻi (Dodonaea viscosa) ʻŌkea (Canthium odoratum) Kōpiko (Psychotria hawaiensis) Māmane (Sophora chrysophylla) Naupaka (Scaevola) ʻŌhelo (Vaccinium reticulatum)

Avoid planting near:

Waterlogged sites (increases Rapid ʻŌhiʻa Death fungal risk) Highly competitive aggressive non-native plants (particularly strawberry guava and feral pigs habitat)

Common Pests

Inspect regularly; prune heavily infested branches; spray with horticultural oil or neem oil in early morning; encourage natural predators like ladybugs
Less problematic on mature trees; prune affected foliage on young plants; avoid excess nitrogen fertilizer which promotes tender growth
Plant in well-draining soils; avoid waterlogged conditions; ensure good air circulation; sterilize pruning tools; remove infected trees; no chemical cure currently available

Uses

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Native Bird Habitat & Nectar Source

Wildlife

ʻŌhiʻa flowers are essential food sources for endangered Hawaiian honeycreepers including the ʻIʻiwi and ʻAmakihi. The tree provides critical nesting habitat and is foundational to Hawaiian forest ecosystems. Restoring ʻŌhiʻa supports native bird conservation. [source]

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Traditional Hawaiian Beverages

Culinary

Young leaves and flowers can be steeped into traditional teas with mild flavor. The plant has been used in Hawaiian culture for beverages and food preparation, though culinary uses are limited in modern times. [source]

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Traditional Hawaiian Medicine

Medicinal

ʻŌhiʻa bark and leaves have been used in traditional Hawaiian (lāʻau lapaʻau) medicine for treating various ailments. Modern research is exploring antimicrobial and anti-inflammatory properties, though traditional use should be guided by Hawaiian practitioners. [source]

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Cultural & Ornamental Uses

Craft

ʻŌhiʻa is deeply significant in Hawaiian culture and is used in lei-making, hula, and traditional ceremonies. The striking flowers are also prized as ornamental specimens in gardens throughout tropical regions. [source]

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Environmental Restoration & Reforestation

Household

ʻŌhiʻa is a cornerstone native species for restoration of Hawaiian forests and watershed protection. Planting ʻŌhiʻa helps combat invasive species, prevent erosion, and restore critical forest habitat. [source]

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

Harvest Tips

ʻŌhiʻa is not typically harvested for crop yield. For ornamental purposes, cut flower clusters when fully open in spring/summer for indoor arrangements. Traditional Hawaiian uses: leaves and bark can be harvested sustainably from mature trees for medicinal tea (consult cultural and medicinal experts). Collect seeds from mature seed capsules in late summer/fall for propagation

Fun Facts

🌱 ʻŌhiʻa is one of the first native plants to colonize fresh lava flows, making it a pioneer species essential to Hawaiian landscape recovery after volcanic eruptions.
🌱 The flowers can range from deep crimson red to bright scarlet to rare yellow or orange; color variation is partly genetic and partly environmental, and the tree may produce different colored flowers in different seasons or on different branches.
🌱 In Hawaiian legend, ʻŌhiʻa is sacred to Pele, the volcano goddess, and there are traditional stories warning against picking ʻŌhiʻa flowers without proper respect—according to some accounts, taking flowers disrespectfully brings rain.

Gardening Terms

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

Annual Deadhead Full Sun Mulch Partial Shade Transplant

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