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How to Grow Hawaiian Olive

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Hawaiian Olive

Nestegis sandwicensis

tree

Nestegis sandwicensis, commonly known as Hawaiian Olive, is a native Hawaiian tree species that produces small, olive-like fruits. This slow-growing, drought-tolerant tree is valuable for Hawaiian native plant restoration and landscaping in tropical and subtropical regions. It plays an important ecological role in native Hawaiian dry and mesic forest ecosystems.

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Example Hawaiian Olive timeline · Pittsburgh, PA (Zone 6b)

  1. Plant Hawaiian Olive

    Around Apr 17

    Near Pittsburgh's average last spring frost.

  2. Tend & protect

    Late spring–summer

    Watering, feeding, and pest-watch reminders.

  3. Harvest Hawaiian Olive

    Late summer into fall

    Before the first fall frost (≈ Nov 8)

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

Growing Conditions

☀️
Sun: Full sun, 6-8 hours daily; tolerates partial shade
💧
Water: Drought-tolerant once established; water regularly during establishment (first 1-2 years), then minimize supplemental watering. Prefers dry to mesic conditions.
📏
Spacing: 240 inches
📅
Days to maturity: 720-1080 (slow-growing; 6-9 years to maturity)
🌱
Planting depth: Plant at same depth as root ball; bare root or containerized plants

Soil

Type: Well-draining loamy to volcanic soil
pH: 6.5-7.5
Amendments:
Volcanic rock or lava rock mulch Compost for soil enrichment Perlite for drainage if soil is heavy

Growing Zones

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Thrives in USDA zones 10-11; best suited to warm, tropical and subtropical climates

10a 10b 11a 11b

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Growth Stages

1

Seedling

3-6 months

Small plants with tender leaves; slow initial growth typical of Hawaiian native trees

Provide consistent moisture without waterlogging; protect from strong winds; use shade cloth in intense sunlight for first few months

2

Establishment

1-2 years

Young trees developing root system and main trunk; gradual height increase

Water regularly but allow soil to dry between waterings; stake if needed in windy areas; mulch base to retain soil moisture and regulate temperature

3

Vegetative Growth

3-5 years

Mature canopy development with dense, small oval-shaped leaves; tree gaining height and branch structure

Reduce watering to encourage drought tolerance; prune lightly to shape if desired; no heavy feeding required

4

Flowering and Fruiting

2-3 months (flowering), fruit ripens over several months

Small, inconspicuous flowers appear; develops small olive-like fruit, typically dark when ripe

Minimal intervention needed; fruit attracts native birds; no fertilizer necessary; allow natural fruit drop

Companion Planting

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Plant with:

Ohi'a Lehua (Metrosideros polymorpha) Native Hawaiian ferns (Cibotium, Polystichum) Kiawe (Prosopis pallida) Santalum (Hawaiian Sandalwood) Sophora chrysophylla (Mamane)

Avoid planting near:

Invasive grasses that compete for water Albizia (Silk Tree) due to allelopathic effects Salt-spray sensitive plants in coastal areas

Common Pests

  • Spray with neem oil or horticultural oil; monitor regularly; prune heavily infested branches

  • Remove with horticultural oil; encourage natural predators; spray with insecticidal soap if severe

  • Use reflective mulch; spray with neem oil; introduce natural predators like ladybugs

Uses

🦋

Native Bird Food

Wildlife

The small fruits are an important food source for native Hawaiian birds, supporting ecosystem restoration and biodiversity in native forest habitats. [source]

🏠

Landscape and Restoration

Household

Highly valued in native plant landscaping and Hawaiian dry/mesic forest restoration projects. Provides structure, shade, and ecological authenticity to gardens. [source]

🍳

Traditional Hawaiian Uses

Culinary

Historically used by Native Hawaiians; fruits were consumed or used in traditional preparations, though little commercial use today. [source]

Harvest Tips

Fruits mature in late summer to fall; harvest by hand when fruit is fully dark/ripe, or allow natural drop for bird consumption. Seed propagation possible but slow. Cuttings can be used for vegetative propagation.

Fun Facts

  • 🌱 Nestegis sandwicensis is endemic to Hawaii, meaning it is found nowhere else in the world naturally.
  • 🌱 The genus Nestegis is part of the olive family (Oleaceae), making it a distant relative of the commercial olive tree.
  • 🌱 This tree is classified as vulnerable in its native habitat due to habitat loss and invasive species competition; cultivation for restoration is an important conservation effort.

Gardening Terms

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

Full Sun Mulch Native Plant Partial Shade
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