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How to Grow ʻŌhiʻa lehua

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ʻŌhiʻa lehua

Metrosideros polymorpha

tree

ʻŌhiʻa lehua is a native Hawaiian tree highly valued for its striking scarlet, pink, or occasionally yellow flowers and dense, dark green foliage. It is one of the first plants to colonize fresh lava flows and plays a vital ecological role in Hawaiian forests. This slow-growing tree can reach 40-50 feet in height and is culturally significant in Hawaiian traditions.

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

  1. Plant ʻŌhiʻa lehua

    Around Apr 17

    Near Pittsburgh's average last spring frost.

  2. Tend & protect

    Late spring–summer

    Watering, feeding, and pest-watch reminders.

  3. 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 promotes best flowering
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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 native habitat, receives abundant rainfall.
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Spacing: 120 inches
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Days to maturity: 3-5 years to first flowering; 5-10 years to mature tree size
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Planting depth: Surface sow seeds with light press into soil; do not bury. Transplants should be planted at same depth as nursery pot

Soil

Type: Well-draining, slightly acidic soil; tolerates volcanic rock, cinder, and nutrient-poor soils
pH: 5.5-7.0
Amendments:
Organic compost Peat moss Aged bark mulch

Growing Zones

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Best suited to USDA zones 10b-11b; requires warm, tropical climates with moderate to high humidity

10b 11a 11b

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Growth Stages

1

Seed and Germination

2-4 weeks

Tiny seeds with minimal germination requirements; seedlings are small and slow-growing initially

Keep soil consistently moist but not waterlogged. Provide bright, indirect light. Germination may take 2-4 weeks; be patient and maintain humidity around seedlings.

2

Seedling to Young Tree

1-2 years

Slow growth phase with development of true leaves and branching structure; plants remain relatively compact

Maintain moderate moisture. Protect from full harsh sun if seedlings are young. Ensure good air circulation to prevent fungal issues. Mulch lightly to retain moisture.

3

Establishment and Growth

2-4 years

Tree develops stronger trunk and more extensive branching; foliage becomes denser and darker green

Reduce watering frequency as tree becomes more established. Minimal pruning needed; remove only dead or diseased branches. Monitor for pests and disease.

4

Flowering

Spring to early summer; some year-round blooming possible

Distinctive flowers appear in dense clusters; colors range from scarlet (most common) to pink, orange, or pale yellow

Maintain consistent care; flowering is promoted by full sun exposure and slight dry periods. Do not over-fertilize, which can reduce flowering. Flowers attract native birds.

5

Mature Tree

10+ years and beyond

Full-sized tree with thick trunk, dense canopy, and regular flowering; reaches 40-50 feet in native habitat

Minimal maintenance required. Provide supplemental water during extended dry periods. Prune selectively to maintain shape. This stage lasts many decades.

Companion Planting

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Plant with:

ʻōlepe (Charpentiera) ʻōpelu (Phyllostegia) Naupaka ʻIlima Loʻulu (Hawaiian fan palm)

Avoid planting near:

Invasive grass species Aggressive non-native weeds Plants requiring heavy fertilization

Common Pests

  • Choose rust-tolerant varieties when available. Ensure good air circulation. Remove infected foliage. Avoid overhead watering. Monitor new growth closely. No chemical cure available; prevention is key.

  • Prune heavily infected branches. Spray with horticultural oil or neem oil on young growth. Monitor regularly and treat early infestations.

  • Increase humidity around plants. Spray foliage with water to dislodge mites. Use miticide sprays if severe infestations occur.

  • Most damage is minimal. Prune affected branches if necessary. Avoid broad-spectrum insecticides that harm native pollinators.

Uses

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Lei and cultural ceremonies

Cultural

The lehua flowers are a traditional Hawaiian lei flower, symbolizing the volcano goddess Pele. They are used in ceremonies, hula presentations, and as cultural decorative items throughout Hawaii. [source]

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Native ecosystem restoration

Ecological

ʻŌhiʻa lehua is critical for Hawaiian forest regeneration and erosion control, particularly on volcanic landscapes. It provides habitat and food for native Hawaiian birds, particularly the ʻapapane and amakihi. [source]

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Traditional Hawaiian medicine

Medicinal

Various parts of ʻōhiʻa have been used in traditional Hawaiian medicine, including bark decoctions for various ailments, though modern clinical evidence is limited. [source]

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Wood and timber

Craft

Dense, strong heartwood was traditionally used for tool handles, small wooden implements, and structural applications in Hawaiian culture. [source]

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Native bird nectar source

Wildlife

The abundant flowers are a primary nectar source for endemic Hawaiian honeycreepers and other native birds, supporting biodiversity in Hawaiian 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

ʻŌhiʻa lehua is not harvested for fruit or edible production. Flowers can be carefully cut for lei making when fully open; cut early morning and use immediately or preserve in water. Branches with flowers can be sustainably harvested for lei, ensuring no more than one-third of flowering growth is taken per season. Seed pods may be collected in late summer if saving seed, though plants self-seed readily.

Fun Facts

  • 🌱 ʻŌhiʻa lehua is the first woody plant to colonize fresh lava flows in Hawaii, sometimes appearing within just a few years of eruption, earning it the nickname 'pioneer tree.'
  • 🌱 The flower color varies by location and elevation—scarlet flowers are most common at lower elevations, while higher-altitude populations may have pink or pale yellow flowers.
  • 🌱 In Hawaiian legend, picking ʻōhiʻa lehua flowers without proper respect or permission was said to anger the volcano goddess Pele and bring misfortune, reflecting deep cultural significance.

Gardening Terms

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

Full Sun Germination Mulch Partial Shade pH True Leaves
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