When to plant Sunflower in Williston, FL
Williston gardeners should plant Sunflower between February 9 and March 2 in spring. With Williston's Zone 9a climate (last frost March 2), Sunflower needs 70–100 days to mature — plant by August 20 for a full harvest.
When to Plant Sunflower in Williston, FL
August in Levy County, Florida — your action list
Here's what deserves your attention in Levy County, Florida this month. Everything below is tailored to Zone 9a and timed around your local frost dates.
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Start harvesting sunflower
Check every 1–2 days. Many of these get tough or go to seed if you wait too long.
Coming up in September — start thinking about
- First harvests: sunflower
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.
Williston, Florida is in USDA Zone 9a. The average last spring frost is March 2 and the first fall frost is November 28, giving you a growing season of approximately 271 days.
At an elevation of 305 feet, Levy County receives approximately 50.5 inches of rainfall annually with predominantly sand soil. Summer highs average 100°F, so Sunflower may need afternoon shade and extra watering during peak heat. Sandy soil warms quickly in spring — great for early planting — but Sunflower will need more frequent watering and organic matter to retain nutrients. Ample rainfall means less supplemental watering, but ensure good drainage to prevent Sunflower root diseases.
Williston Soil Profile
Soil Type
Sand
Soil pH
4.9-6.2
Drainage
Well Drained
Sunflower Planting Risk Windows
Percentages indicate frost risk at transplant. The 70% safe window means there is a 30% chance of frost after transplant — suitable for cold-hardy crops or gardeners with frost protection. The 90% safe window is best for tender plants.
Soil Compatibility in Williston
How your county's soil matches Sunflower's growing requirements.
Soil pH
Your soil pH (4.9–6.2) is more acidic than Sunflower prefers (6.0–7.5). Add garden lime to raise pH.
Soil Texture
Sandy soil in Levy County warms quickly in spring but drains fast. Sunflower will need more frequent watering and regular compost additions to retain nutrients.
Drainage
Drainage is adequate for Sunflower.
Organic Matter
Organic matter is low (1.3%). Add 2-3 inches of compost before planting Sunflower.
How to Plant Sunflower
Succession Planting Sunflower
Sow every 8 weeks. Last sowing by Aug 20 to harvest before frost.
Sunflower Water Budget
Water stress score is 6/10 — consider drought-tolerant varieties and mulching
Monthly Watering Guide for Sunflower
Sunflower needs approximately 0.5 inches of water per week (2.2" per month). Here's how your county's rainfall compares month by month.
| Month | Sunflower Needs | Rainfall | You Supplement | Action |
|---|---|---|---|---|
| Jan | — | 2.4" | 0" | ❄️ Dormant |
| Feb | — | 2.9" | 0" | ❄️ Dormant |
| Mar | 2.2" | 3.5" | 0" | ✅ Rainfall sufficient |
| Apr | 2.2" | 2.1" | 0.1" | 💧 Light watering |
| May | 2.2" | 3" | 0" | ✅ Rainfall sufficient |
| Jun | 2.2" | 7.3" | 0" | ✅ Rainfall sufficient |
| Jul | 2.2" | 8" | 0" | ✅ Rainfall sufficient |
| Aug | 2.2" | 7.1" | 0" | ✅ Rainfall sufficient |
| Sep | 2.2" | 6.1" | 0" | ✅ Rainfall sufficient |
| Oct | 2.2" | 3.8" | 0" | ✅ Rainfall sufficient |
| Nov | 2.2" | 1.9" | 0.3" | 💧 Light watering |
| Dec | — | 2.4" | 0" | ❄️ Dormant |
Water needs are for active growing months only (Mar–Nov in Levy County). Supplement amounts are based on average rainfall — actual needs vary with temperature, soil, and mulching.
Sunflower Heat Requirements (GDD)
What are Growing Degree Days (GDD)?
Growing Degree Days measure the total warmth your plants receive during the growing season. Think of it as a "heat bank" — every day above 50°F deposits warmth that helps your plants grow.
Each plant needs a certain amount of accumulated heat to mature. If your county provides more GDD than the plant needs, it's a great fit. If it's close, you may want to choose faster-maturing varieties or start seeds indoors to get a head start.
Sunflower Planting Timeline — Williston, FL
Sunflower Planting Calendar
| Activity | When | Date Range |
|---|---|---|
| Start Indoors | February 9 | Feb 9 – Feb 23 |
| Transplant Outdoors | February 9 | Feb 9 – Feb 23 |
| Direct Sow | February 9 | Feb 9 – Mar 2 |
| Bloom | May 4 | May 4 – Oct 5 |
Plant 1" deep · 18" apart · Rows 24" apart
Month-by-Month Timeline
| Month | Activities |
|---|---|
| January | — |
| February | Start Indoors Transplant Outdoors Direct Sow |
| March | 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
0.5"/week · Natural rainfall sufficient
📅 Days to Maturity
70–100 days
🧪 Soil pH
Needs 6–7.5 · Your soil: too_acidic
🗺️ USDA Zone
Zone 9a
📆 Growing Season
271 days in Levy County
Growing Tips for Sunflower in Williston
Direct sow Sunflower outdoors after March 02 in Levy County when soil has warmed and frost danger has passed.
Sandy soil in Levy County dries quickly — mulch Sunflower with 2-3 inches of straw and water deeply 2-3 times per week rather than lightly every day.
With summer highs reaching 100°F in Levy County, provide afternoon shade for Sunflower and water deeply in the morning.
Common pests for Sunflower in this region include aphids and slugs. Use row covers early in the season and inspect plants weekly.
General growing tips
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
Check more plant combinations with our Companion Planting Checker →
Sunflower in Other Locations
When should I plant Sunflower in Williston, FL?
In Williston, FL, plant Sunflower after the last frost (around March 2) and before the first frost (around November 28). Best results when soil holds above 50°F.
What growing zone is Williston, FL for Sunflower?
Williston sits in USDA Zone 9a. Sunflower grows reliably in zones 2a through 11b, so it's a good fit here.
Can Sunflower grow in Williston's climate?
Yes — Sunflower grows well in Williston's temperate climate. Williston averages a 271-day frost-free season, with last frost around March 2 and first frost around November 28.
Your Levy County Garden Planner — Free
A 22-page printable planner built for Levy County (Zone 9a). Planting dates, a month-by-month schedule, harvest log, seed inventory, and succession charts — all dialed in for your exact growing season.