When to Plant Sweet Alyssum in Windsor Heights, Iowa (50324)

Location

Windsor Heights, Iowa

ZIP Code

50324

USDA Zone

Last Frost

Saturday, April 25, 2026

📅 Planting Calendar

Direct Sow Outdoors Saturday, March 28, 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 Windsor Heights?

Get your seeds now so they're ready by Saturday, March 28, 2026.

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Other Plants for Windsor Heights

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Growing Sweet Alyssum in Zone 5b

Sweet Alyssum (Lobularia maritima) is a popular garden vegetable. In Windsor Heights, Iowa, which is in USDA Hardiness Zone 5b, you should direct sow seeds around Saturday, March 28, 2026.

Your average last frost date is Saturday, April 25, 2026. Sweet Alyssum grows well when direct sown, as it doesn't transplant well or germinates quickly outdoors.