How to Grow Lehua

iNaturalist

Lehua

Metrosideros polymorpha subsp. newhousei

tree

Lehua is a small to medium-sized Hawaiian native tree endemic to the Big Island of Hawaii, known for its striking scarlet-crimson flowers and deep green foliage. It is a subspecies of the more widespread ʻōhiʻa lehua (Metrosideros polymorpha) and thrives in volcanic landscapes and native forest ecosystems. This tree is culturally significant to Hawaiian communities and provides important nectar sources for native birds.

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Example Lehua timeline · Pittsburgh, PA (Zone 6b)

Plant Lehua
Around Apr 17

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

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

Before the first fall frost (≈ Nov 8)

Sample dates for Pittsburgh, PA. Sign up to get exact 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

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Water: Moderate water needs once established; prefers occasional deep watering rather than frequent shallow watering. Tolerates both wet and dry conditions but grows best with consistent moisture during establishment

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Spacing: 120 inches

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Days to maturity: 1095-1460 days (3-4 years to significant growth; flowering may begin in 4-6 years)

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Planting depth: At soil line; transplant seedlings at same depth they were grown in nursery pots

Soil

Type: Well-draining volcanic or basaltic soil, can tolerate poor, rocky soil

pH: 6.0-7.0

Amendments:

Coarse sand or pumice for drainage Minimal fertilizer needed

Growing Zones

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

10b 11a 11b 12a 12b

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Growth Stages

Seedling/Nursery

6-12 months in nursery

Young plants develop opposite ovate leaves and establish a single main stem. Growth is slow initially with minimal branching.

Keep soil consistently moist but not waterlogged. Provide bright indirect light and protect from strong winds. Fertilize lightly with balanced slow-release fertilizer every 3-4 months.

Establishment

1-2 years after transplanting

Tree develops stronger branching structure with thickening trunk and expanding canopy. Leaves mature to deep green with visible venation.

Reduce watering frequency as root system deepens. Mulch around base to retain moisture and moderate soil temperature. Minimal pruning needed; remove only dead or damaged branches.

Juvenile Growth

2-4 years

Continued canopy expansion and trunk thickening. Tree develops characteristic dense, rounded form. No flowers yet, but plant energy focuses on vegetative growth.

Gradually reduce supplemental watering as drought tolerance increases. Light pruning to shape if desired. Monitor for pests and diseases specific to Hawaiian forests.

Flowering

Typically spring/early summer; flowering may extend 4-6 weeks

Tree produces distinctive brush-like flower clusters in shades of scarlet, crimson, or occasionally orange-red. Flowers are composed of numerous prominent stamens giving pompom-like appearance. Blooms typically appear on branch tips.

Maintain consistent watering during flowering for best bloom production. Light pruning after flowering to maintain shape. Avoid heavy nitrogen fertilizer which promotes foliage over flowers. Pollinators include native honeycreepers and introduced birds.

Fruiting & Maturity

Fruits mature 6-9 months after flowering; tree remains productive indefinitely

Small woody capsule fruits develop from spent flowers, containing numerous tiny seeds. Tree reaches mature height (15-35 feet) and maintains continuous flowering cycles in suitable climates.

Allow some fruit to mature for seed production if conservation is a goal. Collect seed capsules when dry and brown; extract seeds for propagation. Established trees require minimal maintenance and can live decades to centuries.

Companion Planting

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Plant with:

Santalum paniculatum (Hawaiian sandalwood) Sophora chrysophylla (Māmane) Myrsine lessertiana (ʻōlelo) Coprosma spp. (ʻōpuhe) Leptecophylla tameiameiae (ʻōhelo)

Avoid planting near:

Invasive plants such as Morella faya (fire tree/wattle tree) Aggressive non-native grasses like Melinis minutiflora (molasses grass) Psidium guajava (guava) which alters fire regime and ecosystem structure

Common Pests

Inspect nursery stock before purchasing; treat with horticultural oil spray in winter; prune heavily infested branches; biological control via natural enemies in native habitat
Minimal intervention in native settings; pruning to improve air circulation; monitor flowers for damage; avoid excessive nitrogen fertilization
and (Phyllosticta spp., Botryosphaeria)
Ensure good drainage and air circulation; avoid overhead watering; prune out infected branches; generally self-limiting in well-established trees
Use protective fencing around young trees in areas with wild ungulate populations; tree guards on young saplings if needed

Uses

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Native pollinator support

Wildlife

Lehua flowers provide essential nectar for Hawaiian native honeycreepers including the Iiwi and Apapane, which are adapted to feed on the brush-like staminate flowers. The tree is a keystone species in Hawaiian forest ecosystems. [source]

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Hawaiian cultural significance

Cultural

The lehua flower holds deep cultural and spiritual importance in Hawaiian traditions, featured in mele (songs) and hula. The plant is used in lei-making and traditional practices. [source]

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Ornamental landscape tree

Household

Lehua's vibrant flowers, attractive foliage, and tropical form make it a prized ornamental for Hawaiian gardens, native plant gardens, and botanical collections in warm climates. [source]

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Forest restoration and habitat recovery

Ecological

Lehua is used extensively in Hawaiian forest restoration projects to rebuild native ecosystems on the Big Island and restore habitat degraded by invasive species and human activity. [source]

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Lei and floral arrangements

Craft

The distinctive scarlet flower clusters are highly prized for lei-making and traditional Hawaiian floral arrangements, though fresh flowers have limited availability outside Hawaii. [source]

Harvest Tips

Lehua is not harvested for food or commercial products. Seed collection for propagation: Collect mature, dry seed capsules in late summer/fall; air-dry for 1-2 weeks; extract seed and sow immediately or store dry in cool conditions. Seeds have poor viability and should be used fresh for best germination rates. For cultural/ornamental purposes, flowers bloom naturally without harvest required; allow tree to mature for several years before expecting significant flowering.

Fun Facts

🌱 Metrosideros polymorpha subsp. newhousei is endemic to the Mauna Kea region of the Big Island and was once thought to be extinct; conservation efforts have helped establish populations in native forest restoration zones.
🌱 The name 'lehua' may derive from Hawaiian words meaning 'sacred' or 'to kindle,' reflecting both the plant's cultural reverence and the intense red-scarlet color of its flowers that resembles flickering flames.
🌱 Lehua flowers are designed specifically for bird pollination (ornithophily) rather than insect pollination; the brush-like stamens and copious nectar are perfectly adapted for Hawaiian honeycreeper beaks and feeding behavior.

Gardening Terms

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

Full Sun Germination Mulch Partial Shade pH

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