When to Plant Serviceberry in Honolulu, Hawaii (96821)

Location

Honolulu, Hawaii

ZIP Code

96821

USDA Zone

12b

Last Frost

Thursday, January 1, 2026

📅 Your 2026 Planting Dates

Direct Sow Outdoors

Thursday, December 18, 2025

Based on last frost Thursday, January 1, 2026 · Zone 12b

Pro tip: Sow Serviceberry directly outdoors 2 weeks before your last frost date.

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🌿 Plant Details

Scientific Name Amelanchier canadensis

Days to Maturity 1095 days

Mature Height 60-240"

Spread 120"

☀️ Growing Requirements

☀️

Sun

Full Sun to Partial Shade

💧

Water

Moderate (1 inch/week)

↔️

Spacing

120" apart

🌱

Planting Depth

4" deep

Seeds typically germinate in 60-120 days

Ready to Plant Serviceberry in Honolulu?

Get your seeds now so they're ready by Thursday, December 18, 2025.

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🤝 Good Companions

Native PlantsSpring Bulbs

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Full Companion Planting Guide for Serviceberry

See which plants help Serviceberry thrive, which to keep away, and raised bed layout tips →

🛠️ Supplies You'll Need

🌿 Fruit Tree Fertilizer 🕸️ Garden Netting 🚿 Watering Can

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🌾 Seed Saving Guide

🟡 Moderate

✅ Open-pollinated — seeds grow true to parent

When to Harvest Seed

Harvest ripe berries in early summer when deep blue-purple.

Processing

Mash berries, separate seeds from pulp, cold-stratify in damp paper towel for 3–4 months.

Seed Viability

Up to 2 years when stored cool, dark, and dry.

Pro Tip

Cold stratification is essential — skip it and germination rates will be very poor.

🪴

Raised Bed Planting Guides

A 4×8 bed fits 0 plants of Serviceberry. See plant counts, spacing grids, and companion pairings for every bed size →

Frequently Asked Questions

When should I plant Serviceberry in Honolulu, Hawaii? +

In Honolulu (Zone 12b), direct sow Serviceberry outdoors around Thursday, December 18, 2025.

What is the last frost date for Honolulu, Hawaii? +

The average last spring frost date for Honolulu, Hawaii (ZIP 96821) is around Thursday, January 1, 2026. This is based on NOAA climate normals for USDA Zone 12b.

How long does Serviceberry take to grow? +

Serviceberry typically matures in about 1095 days from direct sowing. In Honolulu, that means you can expect harvest around Thursday, December 18, 2025 plus 1095 days.

Should I start Serviceberry indoors or direct sow in Hawaii? +

Serviceberry does best when direct sown outdoors. In Honolulu, sow directly around Thursday, December 18, 2025.

📚 More Serviceberry Planting Guides

🗺️

Serviceberry in Hawaii

Zone-by-zone breakdown · Full state guide

→ 🌡️

Zone 12b Serviceberry Guide

All cities in your zone · Avg dates

→

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Growing Serviceberry in Zone 12b

Serviceberry (Amelanchier canadensis) is a popular garden vegetable. In Honolulu, Hawaii, which is in USDA Hardiness Zone 12b, you should direct sow seeds around Thursday, December 18, 2025.

Your average last frost date is Thursday, January 1, 2026. Serviceberry grows well when direct sown, as it doesn't transplant well or germinates quickly outdoors.