How to Grow ʻŌhiʻa lehua

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ʻŌhiʻa lehua

Metrosideros polymorpha

tree

ʻŌhiʻa lehua is a native Hawaiian canopy tree known for its brilliant crimson, pink, or occasionally yellow brush-like flowers and glossy green leaves. This species is endemic to the Hawaiian Islands and plays a critical ecological role as a foundational forest tree, often being the first to colonize volcanic lava flows. It can grow 40-80 feet tall and is culturally significant in Hawaiian traditions.

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

Plant ʻŌhiʻa lehua
Around Apr 17

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

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

Before the first fall frost (≈ Nov 8)

Sample dates for Pittsburgh, PA. Sign up to get exact ʻŌhiʻa 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; tolerates 30-50% shade

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Water: Moderate water needs once established; prefers consistent moisture but is drought-tolerant after establishment; susceptible to root rot in waterlogged conditions; in native habitat receives substantial rainfall

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Spacing: 120 inches

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Days to maturity: 1800-2400 (3-4 years to first flowering from seedling)

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Planting depth: Plant seeds ¼ inch deep; transplants at same depth as nursery container

Soil

Type: Well-draining volcanic or sandy loam soil; highly adaptable to poor, rocky substrates

pH: 5.5-7.0

Amendments:

Compost or aged bark mulch for moisture retention Volcanic rock or coarse sand for drainage improvement Minimal fertilizer needed; native to nutrient-poor soils

Growing Zones

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Thrives in USDA zones 10-12; best in humid tropical and subtropical climates

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

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Growth Stages

Seedling

6-12 months

Small seedlings with tender, opposite-paired leaves; slow initial growth over 6-12 months

Keep soil consistently moist but not waterlogged; protect from direct sun; use well-draining seed-starting mix; maintain humidity

Juvenile/Establishment

1-2 years

Young tree developing woody stem and broader canopy; leaves become larger and more leathery; height growth accelerates

Gradually acclimate to full sun; stake for support in windy conditions; mulch to conserve moisture; minimal pruning needed

Vegetative Growth

1-2 years

Rapid height and branch development; dense foliage production; tree structure becoming established

Continue mulching; remove competing weeds; light pruning to shape if desired; monitor for pests

Flowering

Extended flowering period; individual flowers persist 2-3 weeks

Distinctive brush-like flower clusters (4-6 inches long) in crimson, pink, scarlet, or rare yellow; flowers appear abundantly on branch tips

Flowers appear sporadically year-round, with peak blooming in late spring/summer; ensure adequate sunlight for flowering; do not over-fertilize

Fruit Production & Maturation

4-6 months seed maturation; trees continue producing seeds annually once mature

Small, dry woody capsules develop after flowering; mature to brown and split open to release numerous tiny seeds

Allow natural seed dispersal or collect mature capsules for propagation; no special care needed; seeds are viable immediately after maturation

Companion Planting

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Plant with:

Native Hawaiian ohia understory plants Hapu'u fern (Cibotium hawaiicum) Native Hawaiian 'ama'u fern Maile vine (Alyxia stellata) Native Hawaiian lobelias ʻIʻiwi (understory plantings for bird habitat)

Avoid planting near:

Species highly susceptible to Rapid ʻŌhiʻa Death disease in same microhabitat Aggressive non-native invasive species (fountain grass, strawberry guava) Plants requiring consistently dry conditions in areas with high humidity

Common Pests

No cure available; focus on prevention by maintaining tree vigor, avoiding wounds, quarantining affected trees, controlling insect vectors (ambrosia beetles), and planting disease-resistant individuals when identified
Keep trees healthy and stress-free to increase resistance; remove infested branches; insecticides generally ineffective due to beetle tunneling; maintain proper watering
Spray with horticultural oil in early morning or late evening; encourage natural predators; severe infestations warrant neem oil applications
Increase humidity through misting; spray with water to dislodge; use miticide if severe; improve air circulation
Monitor for damage; encourage natural predators; use neem oil for significant populations

Uses

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Nectar source for beverages

Culinary

ʻŌhiʻa lehua flowers produce abundant nectar that Hawaiian traditions incorporate into herbal infusions and ceremonial preparations. The nectar can be dissolved in water for a slightly sweet beverage. [source]

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Traditional Hawaiian medicine

Medicinal

Historically used in Hawaiian traditional medicine for various remedies; bark, leaves, and flowers have been employed in preparations for respiratory support and general wellness. Modern research continues to explore bioactive compounds. [source]

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Ornamental canopy and shade tree

Household

Prized as an ornamental tree in tropical landscapes for its striking crimson flowers, evergreen foliage, and graceful branching habit. Provides excellent shade and structural beauty to gardens and properties. [source]

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Native bird habitat and food source

Wildlife

Critical food source for Hawaiian native birds (especially ʻiʻiwi, amakihi, and apapane) which feed on nectar from the flowers. Supports arthropod populations and provides nesting habitat. [source]

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Cultural significance and lei

Craft

Flowers are traditionally used in Hawaiian lei-making and hula ceremonies, holding deep cultural and spiritual significance. Wood is traditionally used in Hawaiian crafts and tool-making. [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, allow flower capsules to mature fully on the tree until they turn brown and begin splitting naturally (4-6 months after flowering). Collect capsules just before or after natural opening; store seeds in cool, dry conditions. Seeds have high viability when fresh and recalcitrant (lose viability over months to years). No timber or foliage harvest recommended for ornamental specimens; in Hawaiian cultural practices, flowers and leaves may be ceremonially harvested with respect.

Fun Facts

🌱 ʻŌhiʻa lehua is one of the most variable trees in Hawaii, with flower colors ranging from deep crimson to pink, orange, and rare yellow forms; this variation occurs even within the same population and is genetically determined.
🌱 The species can grow on nearly barren lava flows with virtually no soil, making it a pioneer species that helps create the substrate for other plants; some trees thrive on flows less than 200 years old.
🌱 In Hawaiian mythology, the ʻōhiʻa lehua is associated with the volcano goddess Pele, and there are traditional stories cautioning against removing flowers without proper respect; modern conservation emphasizes protecting remaining native forests.

Gardening Terms

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

Full Sun Mulch Partial Shade

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