When to Plant Larkspur in Honolulu, Hawaii (96821)

Location

Honolulu, Hawaii

ZIP Code

96821

USDA Zone

12b

Last Frost

Thursday, January 1, 2026

📅 Planting Calendar

Direct Sow Outdoors Thursday, December 4, 2025

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

🌿 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 Honolulu?

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

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Growing Larkspur in Zone 12b

Larkspur (Consolida ajacis) is a popular garden vegetable. In Honolulu, Hawaii, which is in USDA Hardiness Zone 12b, 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.