When to plant Fennel in Lee County, FL
In Zone 10b (Lee County), direct-sow Fennel between January 28 and February 18 for spring, after the January 28 last-frost mark.
When to Plant Fennel in Lee County, FL
What to do in August
Each item below is timed to Lee County, Florida's frost dates and soil temperatures. Skip nothing, stress about nothing.
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Plant fall tomatoes & peppers
Late August is your fall transplant window. Pick heat-tolerant determinate tomatoes (Heatmaster, Solar Fire, Phoenix). They'll set fruit through fall.
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Direct-sow brassicas indoors or in shade
Broccoli, cauliflower, cabbage, Brussels sprouts germinate better in cooler conditions. Start indoors or under shade cloth, transplant in September.
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Refresh mulch & drip lines
Check drip irrigation for clogs (afternoon thunderstorm grit). Top off mulch in all beds before the cool-season crops go in.
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.
Lee County, Florida is in USDA Zone 10b. The average last spring frost is January 28 and the first fall frost is December 19, giving you a growing season of approximately 325 days.
At an elevation of 408 feet, Lee County receives approximately 61.6 inches of rainfall annually with predominantly sand soil. Summer highs average 86°F, providing good warmth for Fennel during the growing season. 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.
Lee County Soil Profile
Soil Type
Sand
Soil pH
5.1-5.9
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 Lee County
How your county's soil matches Fennel's growing requirements.
Soil pH
Your soil pH (5.1–5.9) overlaps with Fennel's range (5.5–7.0), though not a perfect match.
Soil Texture
Sandy soil in Lee 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 (1.4%). 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 20 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 | 2.6" | 3" | 0" | ✅ Rainfall sufficient |
| Feb | 2.6" | 3.3" | 0" | ✅ Rainfall sufficient |
| Mar | 2.6" | 3.6" | 0" | ✅ Rainfall sufficient |
| Apr | 2.6" | 2.8" | 0" | ✅ Rainfall sufficient |
| May | 2.6" | 4" | 0" | ✅ Rainfall sufficient |
| Jun | 2.6" | 7.6" | 0" | ✅ Rainfall sufficient |
| Jul | 2.6" | 10" | 0" | ✅ Rainfall sufficient |
| Aug | 2.6" | 7.7" | 0" | ✅ Rainfall sufficient |
| Sep | 2.6" | 9.3" | 0" | ✅ Rainfall sufficient |
| Oct | 2.6" | 5.1" | 0" | ✅ Rainfall sufficient |
| Nov | 2.6" | 2.7" | 0" | ✅ Rainfall sufficient |
| Dec | 2.6" | 2.5" | 0.1" | 💧 Light watering |
Water needs are for active growing months only (Jan–Dec in Lee 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 — Lee County, FL
Fennel Planting Calendar
| Activity | When | Date Range |
|---|---|---|
| Start Indoors | December 17 | Dec 17 – Dec 31 |
| Transplant Outdoors | February 4 | Feb 4 – Feb 18 |
| Direct Sow | January 28 | Jan 28 – Feb 18 |
| Harvest | April 8 | Apr 8 – May 20 |
Plant 1" deep · 15" apart · Rows 24" apart
Month-by-Month Timeline
| Month | Activities |
|---|---|
| January | Direct Sow |
| 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 · Natural rainfall sufficient
📅 Days to Maturity
60–90 days
🧪 Soil pH
Needs 5.5–7 · Your soil: acceptable
🗺️ USDA Zone
Zone 10b
📆 Growing Season
325 days in Lee County
Growing Tips for Fennel in Lee County
Direct sow Fennel outdoors after January 28 in Lee County when soil has warmed and frost danger has passed.
Sandy soil in Lee 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 Lee County, FL?
Lee County is in Zone 10b with an average last frost of January 28. Plan your Fennel planting based on this frost date — see the calendar above for exact timing.
What planting zone is Lee County, FL?
Lee County, Florida is in USDA Hardiness Zone 10b. The average last spring frost is January 28 and first fall frost is December 19.
When should I plant Fennel in Lee County, FL?
In Lee County, FL, plant Fennel after the last frost (around January 28) and before the first frost (around December 19). Best results when soil holds above 50°F.
What growing zone is Lee County, FL for Fennel?
Lee County sits in USDA Zone 10b. Fennel grows reliably in zones 4a through 10b, so it's a good fit here.
Can Fennel grow in Lee County's climate?
Yes — Fennel grows well in Lee County's temperate climate. Lee County averages a 326-day frost-free season, with last frost around January 28 and first frost around December 19.
Your Lee County Garden Planner — Free
A 22-page printable planner built for Lee County (Zone 10b). Planting dates, a month-by-month schedule, harvest log, seed inventory, and succession charts — all dialed in for your exact growing season.