How to Grow Ohia Ai

iNaturalist

Ohia Ai

Syzygium malaccense

tree

Ohia Ai, also known as Mountain Apple, is a tropical fruit tree native to Southeast Asia and naturalized throughout Hawaii. It produces distinctive bell-shaped red or pink flowers followed by fragrant, crisp fruits that resemble apples in texture but with a subtle floral flavor. This ornamental and productive tree is highly valued in Hawaiian culture and cuisine.

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

Plant Ohia Ai
Around Apr 17

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

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

Before the first fall frost (≈ Nov 8)

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

Growing Conditions

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Sun: Full sun to partial shade; 6+ hours of direct sunlight daily for best fruit production

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Water: High water needs; requires consistent moisture, especially during flowering and fruiting. Water deeply and regularly but ensure drainage to prevent root rot. Tolerant of high rainfall environments.

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Spacing: 240 inches

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Days to maturity: 1080-1440

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Planting depth: Seed: 1 inch deep; transplant: same depth as root ball

Soil

Type: Well-draining volcanic or loamy soil rich in organic matter

pH: 6.0-7.0

Amendments:

Compost Peat moss Coconut coir Mulch for moisture retention

Growing Zones

Find your zone →

Thrives in tropical zones 10b-11, requiring warm, consistently humid conditions year-round

10b 11a 11b

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Growth Stages

Seedling

3-4 weeks

Tender young plant with soft leaves emerging from soil; requires protection from direct sun and wind

Keep soil consistently moist but not waterlogged. Provide 50% shade cloth. Protect from strong winds and herbivory.

Vegetative

1-2 years

Young tree establishing strong trunk and branching structure, with glossy green oval leaves; no flowers yet

Gradually increase sun exposure. Prune lightly to shape structure. Maintain consistent watering and fertilize monthly with balanced fertilizer.

Flowering

4-8 weeks

Tree produces abundant distinctive fuzzy, pompom-like flowers in shades of red, pink, or white, typically in spring

Ensure adequate water during flower development. Maintain regular fertilizing. Avoid pruning during flowering to prevent flower loss.

Fruiting

8-12 weeks

Small green fruits develop and gradually enlarge, maturing to bell-shaped fruits with red or pink skin; fragrant when ripe

Continue consistent watering to support fruit development and prevent fruit drop. Thin fruit if necessary for larger individual fruits. Monitor for pests.

Harvest & Maturity

Ongoing seasonal cycles

Fruits fully ripen with characteristic fragrant aroma and tender, crisp flesh; tree may produce multiple harvests annually

Harvest ripe fruits regularly to encourage continued production. Prune selectively after harvest. Maintain fertility and water for next season's flowers.

Companion Planting

Plan your garden →

Plant with:

Kukui nut tree Coconut palm Passion fruit Papaya Mango Avocado Ground covers (native Hawaiian varieties)

Avoid planting near:

Black walnut Eucalyptus (allelopathic effects) Aggressive competing trees

Common Pests

Remove fallen fruits promptly; use fruit fly traps; maintain sanitation; consider netting ripe fruits
Spray with horticultural oil or insecticidal soap; prune heavily infested branches; encourage natural predators
Spray with water to increase humidity; apply neem oil if severe; maintain adequate moisture
Hand-pick if light infestations; neem oil spray; maintain tree vigor through proper care
and (Phytophthora species)
Ensure excellent drainage; avoid overwatering; improve soil aeration; remove affected roots and repot if necessary

Uses

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Fresh Eating & Tropical Cuisine

Culinary

Ohia Ai fruits are eaten fresh, often sliced and served chilled as a refreshing snack. The crisp, slightly floral flesh can also be used in salads, fruit platters, and traditional Hawaiian dishes. [source]

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Beverages & Preserves

Culinary

The fragrant fruits can be juiced, made into jams, jellies, or fermented beverages. In traditional Hawaiian cuisine, they are sometimes made into a popular drink or dessert component. [source]

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Traditional & Herbal Medicine

Medicinal

In traditional Hawaiian and Southeast Asian medicine, various parts of the Ohia Ai tree—including leaves, bark, and fruits—are used to support digestive health, inflammation reduction, and general wellness. [source]

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Landscape Ornamental

Ornamental

The striking red or pink flowers, glossy foliage, and attractive form make Ohia Ai an excellent ornamental tree for tropical gardens, providing both aesthetic beauty and edible fruits. [source]

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Wildlife & Bird Habitat

Wildlife

The abundant flowers attract pollinators including native Hawaiian birds and insects, while the fruits feed local wildlife and support ecological diversity in tropical gardens. [source]

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

Harvest Tips

Fruits are typically ready to harvest 8-12 weeks after flowering, when they reach full size and emit a distinctive fragrant aroma. Harvest by gently twisting and pulling ripe fruits from branches, or allow them to drop naturally. Most productive in spring and early summer in Hawaii. Fruits continue to ripen slightly after picking. Consume fresh immediately for best flavor and texture, as they do not store well (typically 3-5 days refrigerated).

Fun Facts

🌱 Ohia Ai is called 'Mountain Apple' in English but is native to Malaysia and Indonesia, not North America, and was introduced to Hawaii centuries ago where it has become deeply integrated into Hawaiian culture and cuisine.
🌱 The distinctive fuzzy, pompom-like flowers are highly fragrant and attract native Hawaiian birds and pollinators; they are sometimes used in traditional lei making.
🌱 Unlike true apples, Ohia Ai fruits contain a delicate, crisp flesh inside a thin red or pink skin and have a subtle floral aroma that intensifies as they ripen—the fragrance is often described as the most distinctive characteristic of the fruit.

Gardening Terms

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

Annual Full Sun Partial Shade

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