When to Plant Fennel in Flagler County, FL
May in the garden — Flagler County, Florida
May is a pivotal month for Flagler County, Florida gardens. Focus on these tasks first and you'll set up the rest of the season for success.
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Pick fennel
This is the payoff month. Bring a basket, bring a friend, and get into the beds.
Florence fennel is grown for its swollen bulb-like stem base, which has a mild anise flavor. It is crisp raw in salads and sweet when roasted or braised.
Flagler County, Florida is in USDA Zone 9b. The average last spring frost is February 5 and the first fall frost is December 17, giving you a growing season of approximately 315 days.
At an elevation of 134 feet, Flagler County receives approximately 54.2 inches of rainfall annually with predominantly sand soil. Summer highs average 99°F, so Fennel may need afternoon shade and extra watering during peak heat. Sandy soil warms quickly in spring — great for early planting — but Fennel will need more frequent watering and organic matter to retain nutrients. Ample rainfall means less supplemental watering, but ensure good drainage to prevent Fennel root diseases.
Flagler County Soil Profile
Soil Type
Sand
Soil pH
5.1-5.7
Drainage
Well Drained
Plant 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 Flagler County
How your county's soil matches Fennel's growing requirements.
Soil pH
Your soil pH (5.1–5.7) is more acidic than Fennel prefers (5.5–7.0). Add garden lime to raise pH.
Soil Texture
Sandy soil in Flagler County warms quickly in spring but drains fast. Fennel will need more frequent watering and regular compost additions to retain nutrients.
Drainage
Drainage is adequate for Fennel.
Organic Matter
Organic matter is low (1.6%). Add 2-3 inches of compost before planting Fennel.
How to Plant Fennel
Succession Planting Fennel
Sow every 6.9 weeks. Last sowing by Sep 18 to harvest before frost.
Plant Water Budget
Monthly Watering Guide for Fennel
Fennel needs approximately 0.6 inches of water per week (2.6" per month). Here's how your county's rainfall compares month by month.
| Month | Fennel Needs | Rainfall | You Supplement | Action |
|---|---|---|---|---|
| Jan | — | 2.7" | 0" | ❄️ Dormant |
| Feb | 2.6" | 2.5" | 0.1" | 💧 Light watering |
| Mar | 2.6" | 3" | 0" | ✅ Rainfall sufficient |
| Apr | 2.6" | 2.2" | 0.4" | 💧 Light watering |
| May | 2.6" | 3.7" | 0" | ✅ Rainfall sufficient |
| Jun | 2.6" | 8.8" | 0" | ✅ Rainfall sufficient |
| Jul | 2.6" | 7.7" | 0" | ✅ Rainfall sufficient |
| Aug | 2.6" | 7.4" | 0" | ✅ Rainfall sufficient |
| Sep | 2.6" | 6.9" | 0" | ✅ Rainfall sufficient |
| Oct | 2.6" | 4.7" | 0" | ✅ Rainfall sufficient |
| Nov | 2.6" | 2" | 0.6" | 💧 Light watering |
| Dec | 2.6" | 2.5" | 0.1" | 💧 Light watering |
Water needs are for active growing months only (Feb–Dec in Flagler County). Supplement amounts are based on average rainfall — actual needs vary with temperature, soil, and mulching.
Fennel 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.
Fennel Planting Timeline — Flagler County, FL
Fennel Planting Calendar
| Activity | When | Date Range |
|---|---|---|
| Start Indoors | December 25 | Dec 25 – Jan 8 |
| Transplant Outdoors | February 12 | Feb 12 – Feb 26 |
| Direct Sow | February 5 | Feb 5 – Feb 26 |
| Harvest | April 16 | Apr 16 – May 28 |
Plant 1" deep · 15" apart · Rows 24" apart
Month-by-Month Timeline
| Month | Activities |
|---|---|
| January | Start Indoors |
| February | Transplant Outdoors Direct Sow |
| March | — |
| April | Harvest |
| May | Harvest |
| June | — |
| July | — |
| August | — |
| September | — |
| October | — |
| November | — |
| December | Start Indoors |
Growing Conditions
☀️ Sun
Full Sun (6-8+ hours)
💧 Water
0.6"/week · Only during dry spells
📅 Days to Maturity
60–90 days
🧪 Soil pH
Needs 5.5–7 · Your soil: too_acidic
🗺️ USDA Zone
Zone 9b
📆 Growing Season
315 days in Flagler County
Growing Tips for Fennel in Flagler County
Direct sow Fennel outdoors after February 05 in Flagler County when soil has warmed and frost danger has passed.
Sandy soil in Flagler County dries quickly — mulch Fennel with 2-3 inches of straw and water deeply 2-3 times per week rather than lightly every day.
With summer highs reaching 99°F in Flagler County, provide afternoon shade for Fennel and water deeply in the morning.
Common pests for Fennel in this region include carrot rust fly and parsleyworm. Use row covers early in the season and inspect plants weekly.
General growing tips
Direct sow in late summer for fall harvest to reduce bolting. Hill soil around bulbs as they enlarge. Harvest when bulbs are tennis-ball sized before they elongate.
Companion Planting
Good Companions
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Fennel in Other Locations
Frequently Asked Questions
When should I plant Fennel in Flagler County, FL?
Flagler County is in Zone 9b with an average last frost of February 5. Plan your Fennel planting based on this frost date — see the calendar above for exact timing.
What planting zone is Flagler County, FL?
Flagler County, Florida is in USDA Hardiness Zone 9b. The average last spring frost is February 5 and first fall frost is December 17.
Your Flagler County Garden Planner — Free
A 24-page printable planner built for Flagler County (Zone 9b). Planting dates, a month-by-month schedule, harvest log, seed inventory, and succession charts — all dialed in for your exact growing season.