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🌻 Growing Sunflower in Zone 13b

Zone 13b has a year-round growing season. Sunflower can be planted almost any time with proper planning. Last frost: Jan 1. First frost: Dec 31.

Planting Calendar

Indoor

Outdoor

Harvest

Dec 11Dec 31

Season: Jan 1 – Dec 31 (364 days) · Succession: plant every 2 weeks (up to 19x)

Zone13b

Last FrostJan 1

First FrostDec 31

Season Length364 days

Days to Harvest90

SunFull Sun

Frost ToleranceNone

Spacing1/sqft (12" apart)

When to Plant Sunflower in Zone 13b

Start Seeds Indoors: Dec 11

Start Sunflower seeds indoors around Dec 11 (3 weeks before last frost). Optimal germination temperature: 75°F. Germinates in 7–14 days.

Transplant Outdoors: Jan 8

Transplant Sunflower seedlings outdoors after Jan 8. Wait until soil temperature reaches 55°F. Space plants at 1/sqft (12" apart). Harden off plants for a week before moving outside.

Harvest: Mar 14

First harvest approximately Mar 14 (~65 days from transplant). Continue harvesting until first frost (Dec 31).

Companion Planting

✅ Cucumbers✅ Squash ✅ Corn✅ Beans

❌ Potatoes

Sunflower in Other Zones

1a 1b 2a 2b 3a 3b 4a 4b 5a 5b 6a 6b 7a 7b 8a 8b 9a 9b 10a 10b 11a 11b 12a 12b 13a 13b

Frequently Asked Questions

When should I plant Sunflower in Zone 13b?

Start Sunflower seeds indoors around Dec 11. Transplant outdoors after Jan 8. Expect first harvest around Mar 14.

What is the last frost date for Zone 13b?

The average last spring frost date for Zone 13b is Jan 1. The first fall frost averages Dec 31, giving a 364-day growing season.

Can I grow Sunflower in Zone 13b?

Yes. Sunflower needs 90 days to harvest. Zone 13b has a 364-day growing season, which is sufficient. You can plant up to 19 successions.

What is the best month to plant Sunflower in Zone 13b?

The best time to start Sunflower in Zone 13b is Dec. Begin seeds indoors around Dec 11, then transplant outdoors after the last frost date of Jan 1.

What companion plants grow well with Sunflower?

Good companion plants for Sunflower include Cucumbers, Squash, Corn, Beans. Avoid planting Sunflower near Potatoes.

How long does Sunflower take to harvest?

Sunflower takes approximately 90 days from planting to harvest. In Zone 13b, expect your first harvest around Mar 14.

Plan Your Sunflower Garden

Track Sunflower from seed to harvest with personalized frost dates, watering recommendations, and companion planting visualization.

Start Free Sunflower Growing Guide