When to Plant Celosia in Haiku, Hawaii (96708)

Location

Haiku, Hawaii

ZIP Code

96708

USDA Zone

12a

Last Frost

Thursday, January 1, 2026

📅 Your 2026 Planting Dates

Start Seeds Indoors

Thursday, November 20, 2025

Transplant Outdoors

Thursday, January 8, 2026

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

Pro tip: Start Celosia seeds indoors 6 weeks before your last frost date, then transplant outdoors around Thursday, January 8, 2026.

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🌿 Plant Details

Scientific Name Celosia argentea

Days to Maturity 75 days

Mature Height 12-36"

Spread 9"

☀️ Growing Requirements

☀️

Sun

Full Sun (6-8 hours)

💧

Water

Moderate (1 inch/week)

↔️

Spacing

9" apart

🌱

Planting Depth

0.125" deep

Seeds typically germinate in 10-14 days

Ready to Plant Celosia in Haiku?

Get your seeds now so they're ready by Thursday, November 20, 2025.

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🤝 Good Companions

MarigoldZinniaBasil

🤝

Full Companion Planting Guide for Celosia

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

🛠️ Supplies You'll Need

🌱 Seed Starting Trays 🪴 Seed Starting Mix 💡 Grow Lights 🌡️ Heat Mat 🌍 Flower Garden Soil ✂️ Pruning Shears 🚿 Watering Can

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🌾 Seed Saving Guide

🟢 Easy

✅ Open-pollinated — seeds grow true to parent

When to Harvest Seed

Allow plume or cockscomb heads to dry fully on the plant until fluffy or papery.

Processing

Rub dried heads gently between hands over a bowl to release tiny seeds. Dry 1 week.

Seed Viability

Up to 3 years when stored cool, dark, and dry.

Pro Tip

Celosia self-sows readily in warm climates. Seeds are tiny — store in small labeled packets.

🪴

Raised Bed Planting Guides

A 4×8 bed fits 56 plants of Celosia. See plant counts, spacing grids, and companion pairings for every bed size →

Frequently Asked Questions

When should I plant Celosia in Haiku, Hawaii? +

In Haiku (Zone 12a), start Celosia seeds indoors around Thursday, November 20, 2025 and transplant outdoors around Thursday, January 8, 2026.

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

The average last spring frost date for Haiku, Hawaii (ZIP 96708) is around Thursday, January 1, 2026. This is based on NOAA climate normals for USDA Zone 12a.

How long does Celosia take to grow? +

Celosia typically matures in about 75 days from transplanting. In Haiku, that means you can expect harvest around Thursday, January 8, 2026 plus 75 days.

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

Celosia should be started indoors 6 weeks before your last frost date. In Haiku, that means starting around Thursday, November 20, 2025.

📚 More Celosia Planting Guides

🗺️

Celosia in Hawaii

Zone-by-zone breakdown · Full state guide

→ 🌡️

Zone 12a Celosia Guide

All cities in your zone · Avg dates

→

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Growing Celosia in Zone 12a

Celosia (Celosia argentea) is a popular garden vegetable. In Haiku, Hawaii, which is in USDA Hardiness Zone 12a, you should start seeds indoors around Thursday, November 20, 2025.

Your average last frost date is Thursday, January 1, 2026. Plan to transplant your Celosia seedlings outdoors around Thursday, January 8, 2026, about 1 weeks after your last frost date.