When to Plant Petunia in Los Angeles, California (90021)

Location

Los Angeles, California

ZIP Code

90021

USDA Zone

10b

Last Frost

Thursday, January 15, 2026

📅 Planting Calendar

Start Seeds Indoors Thursday, November 6, 2025

Transplant Outdoors Thursday, January 29, 2026

Pro Tip: Start Petunia seeds indoors 10 weeks before your last frost date, then transplant outdoors around Thursday, January 29, 2026.

🌿 Plant Details

Scientific Name Petunia × hybrida

Days to Maturity 75 days

Mature Height 6-18"

Spread 18"

Type Annual

☀️ Growing Requirements

☀️

Sun

Full Sun (6-8 hours)

💧

Water

Moderate (1 inch/week)

↔️

Spacing

12" apart

🌱

Planting Depth

0.13" deep

Seeds typically germinate in 7-14 days

Ready to Plant Petunia in Los Angeles?

Get your seeds now so they're ready by Thursday, November 6, 2025.

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🤝 Good Companions

TomatoBasilMarigold

⚠️ Avoid Planting Near

Fennel

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Growing Petunia in Zone 10b

Petunia (Petunia × hybrida) is a popular garden vegetable. In Los Angeles, California, which is in USDA Hardiness Zone 10b, you should start seeds indoors around Thursday, November 6, 2025.

Your average last frost date is Thursday, January 15, 2026. Plan to transplant your Petunia seedlings outdoors around Thursday, January 29, 2026, about 2 weeks after your last frost date.