When to Plant Hollyhock 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 15, 2026

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

Pro tip: Start Hollyhock seeds indoors 6 weeks before your last frost date, then transplant outdoors around Thursday, January 15, 2026.

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🌿 Plant Details

Scientific Name Alcea rosea

Days to Maturity 365 days

Mature Height 48-96"

Spread 24"

☀️ Growing Requirements

☀️

Sun

Full Sun (6-8 hours)

💧

Water

Moderate (1 inch/week)

↔️

Spacing

18" apart

🌱

Planting Depth

0.25" deep

Seeds typically germinate in 10-14 days

Ready to Plant Hollyhock in Haiku?

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

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🤝 Good Companions

RoseVegetable Garden

🤝

Full Companion Planting Guide for Hollyhock

See which plants help Hollyhock 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 seed pods (disc-shaped) to dry on the stalk after petals drop. Harvest when brown and papery.

Processing

Remove seeds from papery rings, spread to dry 1 week before storing.

Seed Viability

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

Pro Tip

Hollyhocks cross freely with other hollyhock varieties. Expect some color variation in seed-grown plants.

🪴

Raised Bed Planting Guides

A 4×8 bed fits 14 plants of Hollyhock. See plant counts, spacing grids, and companion pairings for every bed size →

Frequently Asked Questions

When should I plant Hollyhock in Haiku, Hawaii? +

In Haiku (Zone 12a), start Hollyhock seeds indoors around Thursday, November 20, 2025 and transplant outdoors around Thursday, January 15, 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 Hollyhock take to grow? +

Hollyhock typically matures in about 365 days from transplanting. In Haiku, that means you can expect harvest around Thursday, January 15, 2026 plus 365 days.

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

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

📚 More Hollyhock Planting Guides

🗺️

Hollyhock in Hawaii

Zone-by-zone breakdown · Full state guide

→ 🌡️

Zone 12a Hollyhock Guide

All cities in your zone · Avg dates

→

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Growing Hollyhock in Zone 12a

Hollyhock (Alcea rosea) 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 Hollyhock seedlings outdoors around Thursday, January 15, 2026, about 2 weeks after your last frost date.