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When to Plant Sweet Alyssum in Suisun City, California (94585)

Location

Suisun City, California

ZIP Code

94585

USDA Zone

9b

Last Frost

Tuesday, February 10, 2026

📅 Planting Calendar

Direct Sow Outdoors Tuesday, January 13, 2026

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 Suisun City?

Get your seeds now so they're ready by Tuesday, January 13, 2026.

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Growing Sweet Alyssum in Zone 9b

Sweet Alyssum (Lobularia maritima) is a popular garden vegetable. In Suisun City, California, which is in USDA Hardiness Zone 9b, you should direct sow seeds around Tuesday, January 13, 2026.

Your average last frost date is Tuesday, February 10, 2026. Sweet Alyssum grows well when direct sown, as it doesn't transplant well or germinates quickly outdoors.