When to Plant Basil in Terrebonne Parish, LA
Your May game plan for Terrebonne Parish, Louisiana
Here's what deserves your attention in Terrebonne Parish, Louisiana this month. Everything below is tailored to Zone 9b and timed around your local frost dates.
-
It's harvest week for basil
The more you pick, the more the plant produces. Letting fruit overripen tells the plant it's time to stop.
Get ahead of June
- First harvests: basil
Basil is a fragrant warm-season herb essential to Italian and Thai cuisines. It comes in many varieties including sweet, Thai, purple, and lemon types.
Terrebonne Parish, Louisiana is in USDA Zone 9b. The average last spring frost is February 7 and the first fall frost is December 8, giving you a growing season of approximately 304 days.
At an elevation of 484 feet, Terrebonne Parish receives approximately 61.9 inches of rainfall annually with predominantly sandy loam soil. Summer highs average 102°F, so Basil may need afternoon shade and extra watering during peak heat. Sandy soil warms quickly in spring — great for early planting — but Basil will need more frequent watering and organic matter to retain nutrients. Ample rainfall means less supplemental watering, but ensure good drainage to prevent Basil root diseases.
Terrebonne Parish Soil Profile
Soil Type
Sandy Loam
Soil pH
5.1-6.4
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 Terrebonne Parish
How your county's soil matches Basil's growing requirements.
Soil pH
Your soil pH (5.1–6.4) is more acidic than Basil prefers (6.0–7.0). Add garden lime to raise pH.
Soil Texture
Sandy soil in Terrebonne Parish warms quickly in spring but drains fast. Basil will need more frequent watering and regular compost additions to retain nutrients.
Drainage
Drainage is adequate for Basil.
Organic Matter
Organic matter is low (2.0%). Add 2-3 inches of compost before planting Basil.
How to Plant Basil
Succession Planting Basil
Sow every 5.7 weeks. Last sowing by Sep 24 to harvest before frost.
Plant Water Budget
Monthly Watering Guide for Basil
Basil 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 | Basil Needs | Rainfall | You Supplement | Action |
|---|---|---|---|---|
| Jan | — | 5.3" | 0" | ❄️ Dormant |
| Feb | 2.6" | 5.5" | 0" | ✅ Rainfall sufficient |
| Mar | 2.6" | 6.1" | 0" | ✅ Rainfall sufficient |
| Apr | 2.6" | 5" | 0" | ✅ Rainfall sufficient |
| May | 2.6" | 5" | 0" | ✅ Rainfall sufficient |
| Jun | 2.6" | 5.3" | 0" | ✅ Rainfall sufficient |
| Jul | 2.6" | 6.2" | 0" | ✅ Rainfall sufficient |
| Aug | 2.6" | 5.7" | 0" | ✅ Rainfall sufficient |
| Sep | 2.6" | 4.1" | 0" | ✅ Rainfall sufficient |
| Oct | 2.6" | 3.7" | 0" | ✅ Rainfall sufficient |
| Nov | 2.6" | 4.9" | 0" | ✅ Rainfall sufficient |
| Dec | 2.6" | 5.1" | 0" | ✅ Rainfall sufficient |
Water needs are for active growing months only (Feb–Dec in Terrebonne Parish). Supplement amounts are based on average rainfall — actual needs vary with temperature, soil, and mulching.
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.
Basil Planting Timeline — Terrebonne Parish, LA
Basil Planting Calendar
| Activity | When | Date Range |
|---|---|---|
| Start Indoors | December 27 | Dec 27 – Jan 10 |
| Transplant Outdoors | February 14 | Feb 14 – Feb 28 |
| Direct Sow | February 14 | Feb 14 – Mar 7 |
| Harvest | April 11 | Apr 11 – Jun 13 |
Plant 0.5" deep · 8" apart · Rows 12" apart
Month-by-Month Timeline
| Month | Activities |
|---|---|
| January | Start Indoors |
| February | Transplant Outdoors Direct Sow |
| March | Direct Sow |
| April | Harvest |
| May | Harvest |
| June | Harvest |
| 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
50–75 days
🧪 Soil pH
Needs 6–7 · Your soil: too_acidic
🗺️ USDA Zone
Zone 9b
📆 Growing Season
304 days in Terrebonne Parish
Growing Tips for Basil in Terrebonne Parish
Direct sow Basil outdoors after February 07 in Terrebonne Parish when soil has warmed and frost danger has passed.
Sandy soil in Terrebonne Parish dries quickly — mulch Basil with 2-3 inches of straw and water deeply 2-3 times per week rather than lightly every day.
With summer highs reaching 102°F in Terrebonne Parish, provide afternoon shade for Basil and water deeply in the morning.
General growing tips
Start seeds indoors or direct sow after last frost. Pinch flower buds to extend leaf production. Harvest leaves from the top down, cutting just above a leaf pair.
Recommended Basil Varieties for Terrebonne Parish
Downy mildew-resistant basil for your humid climate
Companion Planting
Good Companions
Avoid Planting Near
Check more plant combinations with our Companion Planting Checker →
Isolate 150 ft between varieties. Different basil species can cross.
Basil in Other Locations
Frequently Asked Questions
When should I plant Basil in Terrebonne Parish, LA?
Terrebonne Parish is in Zone 9b with an average last frost of February 7. Plan your Basil planting based on this frost date — see the calendar above for exact timing.
What planting zone is Terrebonne Parish, LA?
Terrebonne Parish, Louisiana is in USDA Hardiness Zone 9b. The average last spring frost is February 7 and first fall frost is December 8.
Your Terrebonne Parish Garden Planner — Free
A 24-page printable planner built for Terrebonne Parish (Zone 9b). Planting dates, a month-by-month schedule, harvest log, seed inventory, and succession charts — all dialed in for your exact growing season.