When to Plant Black-eyed Susan in Pasadena, California (91105)

Location

Pasadena, California

ZIP Code

91105

USDA Zone

10a

Last Frost

Sunday, January 25, 2026

📅 Planting Calendar

Direct Sow Outdoors Sunday, December 28, 2025

Pro Tip: Sow Black-eyed Susan directly outdoors 4 weeks before your last frost date.

🌿 Plant Details

Scientific Name Rudbeckia hirta

Days to Maturity 85 days

Mature Height 18-36"

Spread 18"

Type Annual/Perennial

☀️ Growing Requirements

☀️

Sun

Full Sun (6-8 hours)

💧

Water

Low (drought tolerant)

↔️

Spacing

18" apart

🌱

Planting Depth

0.13" deep

Seeds typically germinate in 7-14 days

Ready to Plant Black-eyed Susan in Pasadena?

Get your seeds now so they're ready by Sunday, December 28, 2025.

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Growing Black-eyed Susan in Zone 10a

Black-eyed Susan (Rudbeckia hirta) is a popular garden vegetable. In Pasadena, California, which is in USDA Hardiness Zone 10a, you should direct sow seeds around Sunday, December 28, 2025.

Your average last frost date is Sunday, January 25, 2026. Black-eyed Susan grows well when direct sown, as it doesn't transplant well or germinates quickly outdoors.