When to Plant Sweet Alyssum in Hilo, Hawaii (96721)

Location

Hilo, Hawaii

ZIP Code

96721

USDA Zone

12b

Last Frost

Thursday, January 1, 2026

📅 Planting Calendar

Direct Sow Outdoors Thursday, December 4, 2025

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

🌿 Plant Details

Scientific Name Lobularia maritima

Days to Maturity 45 days

Mature Height 4-8"

Spread 9"

☀️ Growing Requirements

☀️

Sun

Full Sun to Partial Shade

💧

Water

Moderate (1 inch/week)

↔️

Spacing

6" apart

🌱

Planting Depth

0.125" deep

Seeds typically germinate in 5-10 days

Ready to Plant Sweet Alyssum in Hilo?

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

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Other Plants for Hilo

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Growing Sweet Alyssum in Zone 12b

Sweet Alyssum (Lobularia maritima) is a popular garden vegetable. In Hilo, 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. Sweet Alyssum grows well when direct sown, as it doesn't transplant well or germinates quickly outdoors.