How to Grow 'Ohia lehua

Wikimedia Commons

'Ohia lehua

Metrosideros polymorpha

tree

A native Hawaiian tree species prized for its striking crimson, orange, yellow, or pink pom-pom-like flowers and dark green foliage. The 'ohia lehua is culturally significant in Hawaiian traditions and plays a critical role in native Hawaiian ecosystems. This hardy tree can grow from sea level to high elevations and is essential for watershed protection and native bird habitat.

When should you plant 'Ohia lehua in your zone?

Get a personalized planting timeline — when to start seeds, transplant, and harvest — based on your USDA zone and local frost dates. Free to start.

Get my 'Ohia lehua timeline →

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

Plant 'Ohia lehua
Around Apr 17

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

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

Before the first fall frost (≈ Nov 8)

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

Growing Conditions

☀️

Sun: Full sun, 6-8 hours daily; tolerates partial shade but flowers better in full sun

💧

Water: Moderate water needs once established; drought-tolerant but prefers consistent moisture during establishment. Tolerates wet conditions and is adapted to both dry and wet Hawaiian microclimates.

📏

Spacing: 120 inches

📅

Days to maturity: 3-5 years to first flowering from seed

🌱

Planting depth: Surface to 0.5 inches; seeds are tiny and require light to germinate

Soil

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

pH: 5.5-7.0

Amendments:

Volcanic cinder or lava rock Compost for organic matter in poor soils Perlite or coarse sand for drainage in clay soils

Growing Zones

Find your zone →

Thrives in USDA zones 10b-11, particularly in Hawaii and warm coastal regions

10b 11a 11b

Get my 'Ohia lehua timeline →

Growth Stages

Germination & Seedling

3-4 weeks

Tiny seeds germinate on soil surface; delicate seedlings with minimal foliage appear within 2-3 weeks

Keep soil consistently moist but not waterlogged; provide bright, indirect light; use seed-starting mix or coir; protect from strong winds

Juvenile Growth

6-12 months

Young plant develops true leaves and establishes a small root system; grows slowly at first with narrow, elongated foliage

Gradually acclimate to brighter light; water regularly but allow surface to dry between waterings; protect from extreme heat and cold; avoid transplanting stress

Vegetative Development

1-3 years

Tree develops woody stem and branching structure; foliage becomes denser and more established; plant grows 12-24 inches annually once established

Reduce watering frequency as tree matures; maintain well-draining soil; minimal fertilizer needed—'ohia thrives in poor soils; light pruning to shape if desired

Pre-flowering

6-12 months before first flowers

Tree reaches sexual maturity; branch structure thickens and becomes woody; foliage is full and dark green

Ensure full sun exposure for maximum flower production; maintain consistent (not excessive) watering during dry seasons; avoid over-fertilizing which reduces flowering

Flowering & Fruiting

Typically spring-summer, repeating seasonally; capsules mature over 6-8 weeks

Distinctive pom-pom-like flowers appear in clusters at branch tips in colors ranging from crimson to orange, yellow, or pink; flowers followed by small woody capsules containing winged seeds

Provide full sun and moderate water during bloom; flowers attract native Hawaiian birds (especially 'apapane); allow seed capsules to mature and dry naturally for seed dispersal

Companion Planting

Plan your garden →

Plant with:

Lehua haole (Chrysodracon marginata) Santalum paniculatum (Hawaiian sandalwood) Dodonaea viscosa (naio) Coprosma species Native Hawaiian ferns Pittosporum species

Avoid planting near:

Strawberry guava (invasive competitor) Miconia calvescens (clidemia) Faya tree (rapid spreader) Non-native aggressive grasses Japanese tree privet

Common Pests

No chemical control available; genetic resistance varies by strain; purchase plants from rust-resistant nurseries; remove infected branches; report suspected infection to Hawaii Department of Agriculture
Monitor foliage regularly; remove heavily infested branches; encourage natural predators; avoid broad-spectrum pesticides
Prune affected branches; spray with horticultural oil in early morning or late evening; ensure good air circulation
Generally minor; increase air circulation; remove affected flower clusters; rarely requires treatment

Uses

🍳

Ceremonial & Traditional Beverages

Culinary

In Hawaiian tradition, 'ohia flowers are used in ceremonial preparations and infusions, though primarily for spiritual and cultural significance rather than everyday food use. [source]

💊

Traditional Hawaiian Medicine

Medicinal

Traditionally used in Hawaiian healing practices for respiratory health and general wellness; flowers contain polyphenolic compounds with antioxidant properties. [source]

🎨

Lei & Floral Arrangements

Craft

The iconic crimson pom-pom flowers are highly prized for authentic Hawaiian lei-making and special occasion arrangements, particularly for cultural ceremonies and celebrations. [source]

🦋

Native Bird & Pollinator Habitat

Wildlife

'Ohia flowers are essential nectar sources for endangered native Hawaiian forest birds including the 'apapane, 'amakihi, and 'i'iwi, supporting ecosystem health and avian populations. [source]

🏠

Watershed Protection & Reforestation

Household

Critical native tree for Hawaiian reforestation efforts and watershed protection; helps prevent erosion, filter water, and restore degraded ecosystems in its native range. [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 mature 6-8 weeks after flowering when seed capsules turn brown and dry; collect mature capsules and allow to dry further indoors; tap gently to release tiny winged seeds; sow seeds immediately or store dry in cool conditions. In Hawaiian tradition, flowers are gathered by hand for lei-making in early morning when fresh; use sustainable harvesting practices respecting cultural and conservation guidelines.

Fun Facts

🌱 'Ohia lehua is considered sacred in Hawaiian culture and features prominently in Hawaiian mythology; according to legend, Pele (the volcano goddess) transforms into the 'ohia tree to show her love for Ohia (a warrior), making it a symbol of love and devotion.
🌱 The tree displays remarkable ecological adaptation, growing from sea level (where it's prostrate and shrubby) to elevations above 9,000 feet on Mauna Kea and Mauna Loa (where it becomes a compact, gnarled tree), demonstrating extreme phenotypic plasticity.
🌱 The 'ohia rust fungus (Puccinia psidii), originally from South America, has devastated 'ohia populations across Hawaii since 2014, killing up to 50% of trees in some areas and earning it the status of 'the largest threat to Hawaiian forests'; scientists are working on breeding rust-resistant varieties to save the species.

Gardening Terms

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

Annual Full Sun Partial Shade Transplant True Leaves

Shop 'Ohia lehua plants and related plants at Plant Addicts →

Join 30,000 gardeners planning their gardens with LizPlants.

Get your personalized 'Ohia lehua planting timeline

Tell us your zip code and we'll calculate exactly when to start 'Ohia lehua seeds, transplant seedlings, and harvest — based on your USDA zone and local frost dates. Includes calendar reminders and printable task lists. Free to start.

Get my 'Ohia lehua timeline →