When to Plant Larkspur in Haiku, Hawaii (96708)

Location

Haiku, Hawaii

ZIP Code

96708

USDA Zone

12a

Last Frost

Thursday, January 1, 2026

📅 Your 2026 Planting Dates

Direct Sow Outdoors

Thursday, December 4, 2025

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

Pro tip: Sow Larkspur directly outdoors 4 weeks before your last frost date.

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🌿 Plant Details

Scientific Name Consolida ajacis

Days to Maturity 65 days

Mature Height 24-48"

Spread 12"

☀️ Growing Requirements

☀️

Sun

Full Sun to Partial Shade

💧

Water

Moderate (1 inch/week)

↔️

Spacing

9" apart

🌱

Planting Depth

0.25" deep

Seeds typically germinate in 14-21 days

Ready to Plant Larkspur in Haiku?

Get your seeds now so they're ready by Thursday, December 4, 2025.

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🤝 Good Companions

CosmosZinniaRose

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Full Companion Planting Guide for Larkspur

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

🛠️ Supplies You'll Need

🌍 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 to turn brown and dry on the stalk. Harvest before pods split open.

Processing

Crack dry pods to release tiny seeds. Dry in open envelope for 1 week.

Seed Viability

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

Pro Tip

All parts of larkspur are toxic — wash hands thoroughly after handling seeds. Self-sows readily once established.

🪴

Raised Bed Planting Guides

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

Frequently Asked Questions

When should I plant Larkspur in Haiku, Hawaii? +

In Haiku (Zone 12a), direct sow Larkspur outdoors around Thursday, December 4, 2025.

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 Larkspur take to grow? +

Larkspur typically matures in about 65 days from direct sowing. In Haiku, that means you can expect harvest around Thursday, December 4, 2025 plus 65 days.

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

Larkspur does best when direct sown outdoors. In Haiku, sow directly around Thursday, December 4, 2025.

📚 More Larkspur Planting Guides

🗺️

Larkspur in Hawaii

Zone-by-zone breakdown · Full state guide

→ 🌡️

Zone 12a Larkspur Guide

All cities in your zone · Avg dates

→

Other Plants for Haiku

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Growing Larkspur in Zone 12a

Larkspur (Consolida ajacis) is a popular garden vegetable. In Haiku, Hawaii, which is in USDA Hardiness Zone 12a, you should direct sow seeds around Thursday, December 4, 2025.

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