When to plant Fennel in Jefferson County County,
Aim to plant Fennel in Jefferson County County on or after March 9; the window stays open through March 30. Jefferson County County's 257-day frost-free season gives you plenty of room for a spring and fall cycle.
When to Plant Fennel in Jefferson County, FL
June to-do list for Jefferson County, Florida
June is a pivotal month for Jefferson County, Florida gardens. Focus on these tasks first and you'll set up the rest of the season for success.
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Collect fennel at their peak
The more you pick, the more the plant produces. Letting fruit overripen tells the plant it's time to stop.
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.
Jefferson County, Florida is in USDA Zone 9a. The average last spring frost is March 9 and the first fall frost is November 21, giving you a growing season of approximately 257 days.
At an elevation of 105 feet, Jefferson County receives approximately 56 inches of rainfall annually with predominantly sand soil. Summer highs average 95°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.
Jefferson County Soil Profile
Soil Type
Sand
Soil pH
5.2-5.9
Drainage
Well Drained
Fennel 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 Jefferson County
How your county's soil matches Fennel's growing requirements.
Soil pH
Your soil pH (5.2–5.9) overlaps with Fennel's range (5.5–7.0), though not a perfect match.
Soil Texture
Sandy soil in Jefferson 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 (1.3%). Add 2-3 inches of compost before planting Fennel.
How to Plant Fennel
Succession Planting Fennel
Sow every 6.9 weeks. Last sowing by Aug 23 to harvest before frost.
Fennel 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 | — | 3" | 0" | ❄️ Dormant |
| Feb | — | 2.9" | 0" | ❄️ Dormant |
| Mar | 2.6" | 3.2" | 0" | ✅ Rainfall sufficient |
| Apr | 2.6" | 2.4" | 0.2" | 💧 Light watering |
| May | 2.6" | 3.8" | 0" | ✅ Rainfall sufficient |
| Jun | 2.6" | 7.8" | 0" | ✅ Rainfall sufficient |
| Jul | 2.6" | 8.9" | 0" | ✅ Rainfall sufficient |
| Aug | 2.6" | 7.4" | 0" | ✅ Rainfall sufficient |
| Sep | 2.6" | 6.4" | 0" | ✅ Rainfall sufficient |
| Oct | 2.6" | 5" | 0" | ✅ Rainfall sufficient |
| Nov | 2.6" | 2.5" | 0.1" | 💧 Light watering |
| Dec | — | 2.7" | 0" | ❄️ Dormant |
Water needs are for active growing months only (Mar–Nov in Jefferson 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 — Jefferson County, FL
Fennel Planting Calendar
| Activity | When | Date Range |
|---|---|---|
| Start Indoors | January 26 | Jan 26 – Feb 9 |
| Transplant Outdoors | March 16 | Mar 16 – Mar 30 |
| Direct Sow | March 9 | Mar 9 – Mar 30 |
| Harvest | May 18 | May 18 – Jun 29 |
Plant 1" deep · 15" apart · Rows 24" apart
Month-by-Month Timeline
| Month | Activities |
|---|---|
| January | Start Indoors |
| February | Start Indoors |
| March | Transplant Outdoors Direct Sow |
| April | — |
| May | Harvest |
| June | Harvest |
| July | — |
| August | — |
| September | — |
| October | — |
| November | — |
| December | — |
Growing Conditions
☀️ Sun
Full Sun (6-8+ hours)
💧 Water
0.6"/week · Natural rainfall sufficient
📅 Days to Maturity
60–90 days
🧪 Soil pH
Needs 5.5–7 · Your soil: acceptable
🗺️ USDA Zone
Zone 9a
📆 Growing Season
257 days in Jefferson County
Growing Tips for Fennel in Jefferson County
Direct sow Fennel outdoors after March 09 in Jefferson County when soil has warmed and frost danger has passed.
Sandy soil in Jefferson County dries quickly — mulch Fennel with 2-3 inches of straw and water deeply 2-3 times per week rather than lightly every day.
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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Check more plant combinations with our Companion Planting Checker →
Fennel in Other Locations
Frequently Asked Questions
When should I plant Fennel in Jefferson County, FL?
Jefferson County is in Zone 9a with an average last frost of March 9. Plan your Fennel planting based on this frost date — see the calendar above for exact timing.
What planting zone is Jefferson County, FL?
Jefferson County, Florida is in USDA Hardiness Zone 9a. The average last spring frost is March 9 and first fall frost is November 21.
When should I plant Fennel in Jefferson County, ?
In Jefferson County, , plant Fennel after the last frost (around March 9) and before the first frost (around November 21). Best results when soil holds above 50°F.
What growing zone is Jefferson County, for Fennel?
Jefferson County sits in USDA Zone 9a. Fennel grows reliably in zones 4a through 10b, so it's a good fit here.
Can Fennel grow in Jefferson County's climate?
Yes — Fennel grows well in Jefferson County's temperate climate. Jefferson County averages a 257-day frost-free season, with last frost around March 9 and first frost around November 21.
Your Jefferson County Garden Planner — Free
A 22-page printable planner built for Jefferson 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.