When to Plant Sunflower in USDA Zone 11b
Zone 11b gardeners: here's your July plan
Each item below is timed to Zone 11b's frost dates and soil temperatures. Skip nothing, stress about nothing.
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Plan the fall garden
Make a planting map for August. Tomatoes, peppers, brassicas, lettuce, root crops all go in over the next 8 weeks. Soil amendments and irrigation prep happen now.
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Keep heat-survivor crops productive
Daily harvest of okra and southern peas keeps plants producing. Let pods over-mature and the plant stops setting new fruit.
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Watch for hurricane prep season
August-October is hurricane season. Stake young trees, secure rain barrels, and plan how to protect tender transplants from high winds.
Sunflower (Helianthus annuus) is a fast-growing North American native annual famous for its towering stems and brilliant yellow heads. It thrives in full sun and heat, producing large, pollen-rich blooms that attract bees, butterflies, and seed-eating birds. Varieties range from 18-inch dwarfs to 12-foot giants and nearly every color except blue.
In Zone 11b, the average last spring frost is around January 1 and the first fall frost is around December 31, giving you a growing season of approximately 364 days.
Sunflower Planting Timeline — Zone 11b
Where Is USDA Zone 11b?
The map below highlights the states that contain Zone 11b. Click any state to see the Sunflower planting schedule for that location.
Sunflower Planting Calendar — Zone 11b
| Activity | When | Date Range |
|---|---|---|
| Start Indoors | December 11 | Dec 11 – Dec 25 |
| Transplant Outdoors | October 30 | Oct 30 – Nov 13 |
| Direct Sow | October 30 | Oct 30 – Nov 20 |
| Bloom | January 22 | Jan 22 – Sep 3 |
Plant 1" deep · 18" apart · Rows 24" apart
Month-by-Month Timeline
| Month | Activities |
|---|---|
| January | Bloom |
| February | Bloom |
| March | Bloom |
| April | Bloom |
| May | Bloom |
| June | Bloom |
| July | Bloom |
| August | Bloom |
| September | Bloom |
| October | Transplant Outdoors Direct Sow |
| November | Transplant Outdoors Direct Sow |
| December | Start Indoors |
Free Zone 11b Planting Calendar PDF
Know exactly when to plant every crop in your zone. Get a printable month-by-month calendar customized for Zone 11b with start dates, transplant windows, and harvest times.
Growing Conditions
Sun
Full Sun (6-8+ hours)
💧 Water
Low — drought tolerant
Days to Maturity
70–100 days
Soil pH
6 – 7.5
Zone Temperature Range
45°F to 50°F average annual minimum
Growing Season
365 days (Zone 11b average)
Planting Specifications
| Planting Depth | 1 inches |
| Plant Spacing | 18 inches apart |
| Row Spacing | 24 inches between rows |
Succession Planting Sunflower in Zone 11b
Sow every 8 weeks for continuous harvest throughout the season.
Growing Tips for Sunflower in Zone 11b
Zone 11b offers a long growing season (~365 days). You can plant Sunflower earlier and may get multiple harvests.
Direct-sow 1 inch deep after last frost; germination takes 7-14 days at 65-75°F soil. Sunflowers dislike root disturbance so direct sowing is strongly preferred over transplanting. Plant in succession every 2 weeks for extended bloom. Stake tall varieties. Avoid overwatering — they tolerate drought once established. Birds will self-deadhead seed heads; leave them up through fall for wildlife.
Companion Planting
Good Companions
Avoid Planting Near
The Gardener's Encyclopedia to Companion Planting
The pairings that make vegetables, herbs, and flowers grow better — and the ones that quietly wreck a bed.
- Proven pairings for 200+ vegetables, herbs, flowers, and fruits
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Saving Sunflower Seeds
Recommended for Your Garden
Reduce heat stress and sun scorch in hot climates with UV-stabilized shade cloth.
Start seeds indoors with reusable cell trays and humidity domes.
Test your soil pH, nitrogen, phosphorus, and potassium levels before planting.
Related Plants
Sunflower in Other Zones
Sunflower by State
- Alabama
- Alaska
- Arizona
- Arkansas
- California
- Colorado
- Connecticut
- Delaware
- Florida
- Georgia
- Hawaii
- Idaho
- Illinois
- Indiana
- Iowa
- Kansas
- Kentucky
- Louisiana
- Maine
- Maryland
- Massachusetts
- Michigan
- Minnesota
- Mississippi
- Missouri
- Montana
- Nebraska
- Nevada
- New Hampshire
- New Jersey
- New Mexico
- New York
- North Carolina
- North Dakota
- Ohio
- Oklahoma
- Oregon
- Pennsylvania
- Rhode Island
- South Carolina
- South Dakota
- Tennessee
- Texas
- Utah
- Vermont
- Virginia
- Washington
- West Virginia
- Wisconsin
- Wyoming
Frequently Asked Questions
When should I plant Sunflower in Zone 11b?
In Zone 11b, plan your Sunflower planting around the average last frost date of January 1. Start seeds indoors around December 11. Direct sow outdoors around October 30. Transplant seedlings around October 30.
Can Sunflower grow in Zone 11b?
Yes, Sunflower can grow well in Zone 11b, hardy in USDA zones 2a through 11b. Zone 11b has a growing season of approximately 364 days, which is sufficient for Sunflower (70-100 days to maturity).
When can I harvest Sunflower in Zone 11b?
In Zone 11b, expect to harvest Sunflower from January 22 – September 3. Sunflower takes 70-100 days from planting to harvest.
What is the last frost date for Zone 11b?
The average last spring frost in Zone 11b is around January 1, and the first fall frost is around December 31. This gives a growing season of approximately 364 days. These are 50% probability dates — actual frost dates vary year to year.
What should I plant next to Sunflower?
Good companion plants for Sunflower include Cucumbers, Squash, Corn, Tomatoes. These companions can help with pest control, pollination, and nutrient sharing.
Your Zone 11b Garden Planner — Free
A 22-page printable planner tailored to Zone 11b. Planting dates, monthly task lists, harvest log, seed inventory, and succession charts — everything you need to plan a full season.