When to Plant Sunflower in Limestone County, TX
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.
Limestone County, Texas is in USDA Zone 8b. The average last spring frost is March 12 and the first fall frost is November 14, giving you a growing season of approximately 247 days.
At an elevation of 214 feet, Limestone County receives approximately 69.7 inches of rainfall annually with predominantly clay soil. Summer highs average 93°F, providing good warmth for Sunflower during the growing season. Clay soil retains moisture well for Sunflower, but amend with compost to improve drainage and prevent root rot. Ample rainfall means less supplemental watering, but ensure good drainage to prevent Sunflower root diseases.
Limestone County Soil Profile
Soil Type
Clay
Soil pH
6.0-7.0
Drainage
Well Drained
Sunflower Planting Timeline — Limestone County, TX
Sunflower Planting Calendar
| Activity | When | Date Range |
|---|---|---|
| Start Indoors | February 19 | Feb 19 – Mar 5 |
| Transplant Outdoors | February 26 | Feb 26 – Mar 12 |
| Direct Sow | February 26 | Feb 26 – Mar 19 |
| Bloom | May 21 | May 21 – Oct 8 |
Plant 1" deep · 18" apart · Rows 24" apart
Month-by-Month Timeline
| Month | Activities |
|---|---|
| January | — |
| February | Start Indoors Transplant Outdoors Direct Sow |
| March | Start Indoors Transplant Outdoors Direct Sow |
| April | — |
| May | Bloom |
| June | Bloom |
| July | Bloom |
| August | Bloom |
| September | Bloom |
| October | Bloom |
| November | — |
| December | — |
Growing Conditions
☀️ Sun
Full Sun (6-8+ hours)
💧 Water
Low — drought tolerant
📅 Days to Maturity
70–100 days
🧪 Soil pH
Needs 6–7.5 · Your soil: N/A
🗺️ USDA Zone
Zone 8b
📆 Growing Season
247 days in Limestone County
Growing Tips for Limestone County
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
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Sunflower in Other Locations
Frequently Asked Questions
When should I plant Sunflower in Limestone County, TX?
Limestone County is in Zone 8b with an average last frost of March 12. Plan your Sunflower planting based on this frost date — see the calendar above for exact timing.
What planting zone is Limestone County, TX?
Limestone County, Texas is in USDA Hardiness Zone 8b. The average last spring frost is March 12 and first fall frost is November 14.
Your Limestone County Garden Planner — Free
A 22-page printable planner built for Limestone County (Zone 8b). Planting dates, a month-by-month schedule, harvest log, seed inventory, and succession charts — all dialed in for your exact growing season.