How to Grow Pohinahina

Pohinahina

Vitex rotundifolia

shrub

Pohinahina is a native Hawaiian beach shrub known for its small, rounded silvery-green leaves and delicate purple flowers. It grows in coastal sandy areas and is well-adapted to salt spray, strong winds, and poor soil conditions. This evergreen shrub is valued for its ecological role in stabilizing dunes and its ornamental appeal in tropical and subtropical gardens.

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

Plant Pohinahina
Around Apr 17

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

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

Before the first fall frost (≈ Nov 8)

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

Growing Conditions

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Sun: Full sun, 6-8 hours daily minimum; prefers unobstructed light

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Water: Low to moderate water needs once established; drought-tolerant. Water young plants regularly until roots develop; mature plants require minimal supplemental water except during prolonged dry periods.

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Spacing: 36-48 inches

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Days to maturity: Slow-growing; reaches mature size in 3-5 years

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Planting depth: Same depth as root ball; plant at soil level

Soil

Type: Sandy, well-draining soil with low fertility

pH: 6.0-7.5

Amendments:

Minimal fertilization needed Avoid heavy organic matter Salt tolerance makes it suitable for coastal soils

Growing Zones

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Thrives in zones 10-11; tolerates zone 9b with protection

10a 10b 11a 11b

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Growth Stages

Establishment

6-12 months

Young plant developing root system with sparse foliage

Water regularly to establish roots; protect from strong winds initially; avoid overwatering which causes root rot

Vegetative Growth

1-3 years

Plant develops bushy form with silvery-green, rounded leaves; slow lateral spread

Minimal fertilizer needed; light pruning to shape; ensure excellent drainage

Flowering

Spring through fall, periodic blooming

Small purple to lavender flowers appear in clusters; blooms attracting pollinators

Do not fertilize heavily as this reduces flowering; maintain adequate sun exposure

Fruiting

Variable, follows flowering

Small drupe fruits develop after flowers fade; attract native birds and fauna

Allow fruits to mature naturally; fruits support wildlife; no special care needed

Mature

Indefinite; long-lived perennial

Dense, compact shrub with full canopy; very resilient to environmental stress

Minimal maintenance; prune only for shape or size control; extremely salt and wind tolerant

Companion Planting

Plan your garden →

Plant with:

Naupaka Alani Beach morning glory Hui Native Hawaiian grasses Ohai

Avoid planting near:

Invasive vines that compete for space Plants requiring frequent fertilization Species sensitive to salt spray

Common Pests

Prune affected branches; spray with insecticidal soap or neem oil if severe; encourage natural predators
Increase humidity slightly if possible; spray with water to dislodge; use miticide if population is heavy
Monitor foliage undersides; use yellow sticky traps; spray with neem oil or insecticidal soap if needed

Uses

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Dune Stabilization

Ecological

Pohinahina's spreading root system and resilient growth make it invaluable for stabilizing coastal sand dunes and preventing erosion. It is a native Hawaiian species used in habitat restoration and coastal protection projects. [source]

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Native Pollinator & Bird Support

Wildlife

The plant's delicate purple flowers attract native Hawaiian insects and pollinators, while its fruits provide food for native birds and wildlife. It supports local ecosystems in tropical coastal areas. [source]

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Landscape & Garden Design

Ornamental

Its attractive silvery-green foliage, purple flowers, and compact growth habit make it a beautiful addition to tropical and subtropical gardens, particularly in coastal landscapes and xeriscapes. [source]

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Salt Tolerance for Coastal Properties

Household

Pohinahina is highly tolerant of salt spray and windy conditions, making it ideal for oceanfront and beachfront properties where other plants struggle. [source]

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Hawaiian Native Heritage

Cultural

As a native Hawaiian species, pohinahina holds cultural significance and is part of traditional Hawaiian coastal ecosystems. Growing it supports native plant conservation and cultural preservation. [source]

Harvest Tips

Pohinahina is primarily grown as an ornamental and coastal dune stabilizer, not harvested. Fruits may be left to mature naturally for wildlife. Branches can be pruned for landscaping purposes year-round; prune after flowering for shape maintenance.

Fun Facts

🌱 Pohinahina is endemic to Hawaii and naturally occurs only in the Hawaiian Islands, making it a unique species found nowhere else in the wild.
🌱 The plant's name 'pohinahina' comes from Hawaiian, with 'pohi' meaning 'to cover or spread' and 'nahina' meaning 'gray,' referring to its silvery-gray foliage and spreading habit.
🌱 Despite its delicate appearance, pohinahina is incredibly tough and can withstand salt spray, hurricane-force winds, and poor sandy soils that would kill most other plants.

Gardening Terms

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

Full Sun

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