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When to Plant Thai Basil in Wilkinson County, MS

Wilkinson County, Mississippi Zone 9a May

May to-do list for Wilkinson County, Mississippi

May is a pivotal month for Wilkinson County, Mississippi gardens. Focus on these tasks first and you'll set up the rest of the season for success.

Avg. last frost March 3
Avg. first frost November 23
Soil temp (4") 75°F
Watering Low
Pest pressure High
Daylight 13.6 hrs
  1. Start harvesting thai basil

    This is the payoff month. Bring a basket, bring a friend, and get into the beds.

To set up a strong June, finish these tasks
  • First harvests: thai basil

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Thai basil has a distinctive anise-licorice flavor with sturdy purple stems and small leaves. It is essential in Thai, Vietnamese, and other Southeast Asian cuisines.

Wilkinson County, Mississippi is in USDA Zone 9a. The average last spring frost is March 3 and the first fall frost is November 23, giving you a growing season of approximately 265 days.

At an elevation of 379 feet, Wilkinson County receives approximately 54.2 inches of rainfall annually with predominantly clay loam soil. Summer highs average 94°F, providing good warmth for Thai Basil during the growing season. Clay soil retains moisture well for Thai Basil, but amend with compost to improve drainage and prevent root rot. Ample rainfall means less supplemental watering, but ensure good drainage to prevent Thai Basil root diseases.

Wilkinson County, MS (Zone 9a) Long season
265 days
Last Spring Frost March 3
265 growing days
First Fall Frost November 23
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Wilkinson County Soil Profile

Soil Type

Clay Loam

Soil pH

5.3-6.3

Drainage

Well Drained

Plant Planting Risk Windows

Early Start (70% safe) ✓ Fits season (146 days to spare)
Start indoors: Jan 6 Transplant: Feb 24 🍅 Harvest: Apr 21 – Jun 23
Recommended (50%) ✓ Fits season (139 days to spare)
Start indoors: Jan 20 Transplant: Mar 10 🍅 Harvest: May 5 – Jul 7
Safe Start (90%) ✓ Fits season (140 days to spare)
Start indoors: Feb 8 Transplant: Mar 29 🍅 Harvest: May 24 – Jul 26

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 Wilkinson County

How your county's soil matches Thai Basil's growing requirements.

Soil pH

Your soil pH (5.3–6.3) is more acidic than Thai Basil prefers (6.0–7.0). Add garden lime to raise pH.

Soil Texture

The clay loam soil in Wilkinson County is excellent for Thai Basil — good drainage, moisture retention, and nutrient holding capacity.

Organic Matter

Organic matter is moderate (2.6%). Annual compost additions will help Thai Basil.

How to Plant Thai Basil

0.5"
Planting Depth
8"
Between Plants
12"
Between Rows

Succession Planting Thai Basil

6
successive plantings in your 265-day season

Sow every 5.7 weeks. Last sowing by Sep 09 to harvest before frost.

Plant Water Budget

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

Monthly Watering Guide for Thai Basil

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

Month Thai Basil Needs Rainfall You Supplement Action
Jan 4" 0" ❄️ Dormant
Feb 4.4" 0" ❄️ Dormant
Mar 4.3" 5.4" 0" ✅ Rainfall sufficient
Apr 4.3" 3.7" 0.6" 💧 Light watering
May 4.3" 4.7" 0" ✅ Rainfall sufficient
Jun 4.3" 4.1" 0.2" 💧 Light watering
Jul 4.3" 5.9" 0" ✅ Rainfall sufficient
Aug 4.3" 5.7" 0" ✅ Rainfall sufficient
Sep 4.3" 3.6" 0.7" 💧 Light watering
Oct 4.3" 3.8" 0.5" 💧 Light watering
Nov 4.3" 4.5" 0" ✅ Rainfall sufficient
Dec 4.4" 0" ❄️ Dormant

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

Thai Basil 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.

Thai Basil needs ~1,281 GDD — county provides 5,432 GDD Excellent fit

Thai Basil Planting Timeline — Wilkinson County, MS

Thai Basil Planting Calendar

Activity When Date Range
Start Indoors January 20 Jan 20 – Feb 3
Transplant Outdoors March 10 Mar 10 – Mar 24
Direct Sow March 10 Mar 10 – Mar 31
Harvest May 5 May 5 – Jul 7

Plant 0.5" deep · 8" apart · Rows 12" apart

Month-by-Month Timeline

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

☀️ Sun

Full Sun (6-8+ hours)

💧 Water

1"/week · Only during dry spells

📅 Days to Maturity

50–75 days

🧪 Soil pH

Needs 6–7 · Your soil: too_acidic

🗺️ USDA Zone

Zone 9a

📆 Growing Season

265 days in Wilkinson County

Growing Tips for Thai Basil in Wilkinson County

Direct sow Thai Basil outdoors after March 03 in Wilkinson County when soil has warmed and frost danger has passed.

With Wilkinson County's clay soil (32% clay), work in 3-4 inches of compost before planting Thai Basil. Avoid tilling when soil is wet to prevent compaction.

General growing tips

Start seeds indoors or direct sow after last frost. Thai basil holds up better to heat in cooking than sweet basil. Pinch flowers to prolong leaf production.

Companion Planting

Good Companions

Avoid Planting Near

  • Rue
  • Sage

Check more plant combinations with our Companion Planting Checker →

Frequently Asked Questions

When should I plant Thai Basil in Wilkinson County, MS?

Wilkinson County is in Zone 9a with an average last frost of March 3. Plan your Thai Basil planting based on this frost date — see the calendar above for exact timing.

What planting zone is Wilkinson County, MS?

Wilkinson County, Mississippi is in USDA Hardiness Zone 9a. The average last spring frost is March 3 and first fall frost is November 23.

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Your Wilkinson County Garden Planner — Free

A 24-page printable planner built for Wilkinson 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.

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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 Wilkinson County, MS. 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.