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When to Plant Fennel (herb) in Natchitoches Parish, LA

Natchitoches Parish, Louisiana Zone 9a May

This month in Natchitoches Parish, Louisiana

Each item below is timed to Natchitoches Parish, Louisiana's frost dates and soil temperatures. Skip nothing, stress about nothing.

Avg. last frost March 13
Avg. first frost November 12
Soil temp (4") 73°F
Watering Moderate
Pest pressure High
Daylight 13.6 hrs
  1. Start harvesting fennel (herb)

    Taste as you pick. The first ripe produce is the best feedback loop you'll get all season.

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  • First harvests: fennel (herb)

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Herb fennel is grown for its aromatic leaves, stalks, and seeds rather than a bulb. It has a strong anise flavor and its flowers attract beneficial insects.

Natchitoches Parish, Louisiana is in USDA Zone 9a. The average last spring frost is March 13 and the first fall frost is November 12, giving you a growing season of approximately 244 days.

At an elevation of 227 feet, Natchitoches Parish receives approximately 49.2 inches of rainfall annually with predominantly loam soil. Summer highs average 91°F, providing good warmth for Fennel (herb) during the growing season.

Natchitoches Parish, LA (Zone 9a) Long season
244 days
Last Spring Frost March 13
244 growing days
First Fall Frost November 12

Natchitoches Parish Soil Profile

Soil Type

Loam

Soil pH

6.2-7

Drainage

Well Drained

Plant Planting Risk Windows

Early Start (70% safe) ✓ Fits season (116 days to spare)
Start indoors: Feb 4 Transplant: Feb 25 🍅 Harvest: Apr 29 – Jul 8
Recommended (50%) ✓ Fits season (118 days to spare)
Start indoors: Feb 13 Transplant: Mar 6 🍅 Harvest: May 8 – Jul 17
Safe Start (90%) ✓ Fits season (110 days to spare)
Start indoors: Mar 12 Transplant: Apr 2 🍅 Harvest: Jun 4 – Aug 13

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 Natchitoches Parish

How your county's soil matches Fennel (herb)'s growing requirements.

Soil pH

Your soil pH (6.2–7.0) is within Fennel (herb)'s preferred range (5.5–7.0).

Soil Texture

The loam soil in Natchitoches Parish is excellent for Fennel (herb) — good drainage, moisture retention, and nutrient holding capacity.

Organic Matter

Organic matter is moderate (2.2%). Annual compost additions will help Fennel (herb).

How to Plant Fennel (herb)

1"
Planting Depth
15"
Between Plants
24"
Between Rows

Fall planting: Sow 8 weeks before your first frost date for a fall harvest.

Succession Planting Fennel (herb)

4
successive plantings in your 244-day season

Sow every 6.9 weeks. Last sowing by Aug 14 to harvest before frost.

For a dedicated fall crop, sow by Sep 17.

Plant Water Budget

Plant needs
1.0″/week
Rainfall provides
0.9″/week
You supply
0.2″/week
Watering frequency Only during dry spells
Season total 333 gal / 100 sq ft

Monthly Watering Guide for Fennel (herb)

Fennel (herb) needs approximately 1 inches of water per week (4.3" per month). Here's how your county's rainfall compares month by month.

Month Fennel (herb) Needs Rainfall You Supplement Action
Jan 4.2" 0" ❄️ Dormant
Feb 3.8" 0" ❄️ Dormant
Mar 4.3" 4.9" 0" ✅ Rainfall sufficient
Apr 4.3" 3.9" 0.4" 💧 Light watering
May 4.3" 3.7" 0.6" 💧 Light watering
Jun 4.3" 4.5" 0" ✅ Rainfall sufficient
Jul 4.3" 5.2" 0" ✅ Rainfall sufficient
Aug 4.3" 4.8" 0" ✅ Rainfall sufficient
Sep 4.3" 3.9" 0.4" 💧 Light watering
Oct 4.3" 2.7" 1.6" 💧 Light watering
Nov 4.3" 3.8" 0.5" 💧 Light watering
Dec 3.7" 0" ❄️ Dormant

Water needs are for active growing months only (Mar–Nov in Natchitoches Parish). Supplement amounts are based on average rainfall — actual needs vary with temperature, soil, and mulching.

Fennel (herb) 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 (herb) needs ~1,369 GDD — county provides 4,453 GDD Excellent fit

Fennel (herb) Planting Timeline — Natchitoches Parish, LA

Fennel (herb) Planting Calendar

Activity When Date Range
Start Indoors February 13 Feb 13 – Feb 27
Transplant Outdoors March 6 Mar 6 – Mar 20
Direct Sow February 20 Feb 20 – Mar 13
Harvest May 8 May 8 – Jul 17
Fall Sowing September 17 Sep 17 – Oct 1

Plant 1" deep · 15" apart · Rows 24" apart

Month-by-Month Timeline

MonthActivities
January
February Start Indoors Direct Sow
March Transplant Outdoors Direct Sow
April
May Harvest
June Harvest
July Harvest
August
September Fall Sowing
October Fall Sowing
November
December

Growing Conditions

☀️ Sun

Full Sun (6-8+ hours)

💧 Water

1"/week · Only during dry spells

📅 Days to Maturity

60–90 days

🧪 Soil pH

Needs 5.5–7 · Your soil: ideal

🗺️ USDA Zone

Zone 9a

📆 Growing Season

244 days in Natchitoches Parish

Growing Tips for Fennel (herb) in Natchitoches Parish

Direct sow Fennel (herb) outdoors after March 13 in Natchitoches Parish when soil has warmed and frost danger has passed.

Common pests for Fennel (herb) 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 spring or fall. Unlike Florence fennel, herb fennel does not form a bulb. Harvest fronds as needed and seeds when they turn brown. Self-sows readily.

Companion Planting

Good Companions

Avoid Planting Near

  • Tomatoes
  • Peppers
  • Green Beans

Check more plant combinations with our Companion Planting Checker →

Frequently Asked Questions

When should I plant Fennel (herb) in Natchitoches Parish, LA?

Natchitoches Parish is in Zone 9a with an average last frost of March 13. Plan your Fennel (herb) planting based on this frost date — see the calendar above for exact timing.

What planting zone is Natchitoches Parish, LA?

Natchitoches Parish, Louisiana is in USDA Hardiness Zone 9a. The average last spring frost is March 13 and first fall frost is November 12.

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Your Natchitoches Parish Garden Planner — Free

A 24-page printable planner built for Natchitoches Parish (Zone 9a). Planting dates, a month-by-month schedule, harvest log, seed inventory, and succession charts — all dialed in for your exact growing season.

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Data sources: USDA Plant Hardiness Zone Map (2023), NOAA 30-Year Climate Normals. Frost dates are based on 50% probability averages for Natchitoches Parish, LA. Local conditions may vary. Last updated: May 2026.

Sources & credits

Every number on this page traces back to a primary horticulture or government data source. Click through to verify.