When to Plant Blackberries in St. Landry Parish, LA
May in St. Landry Parish, Louisiana — your action list
May rewards gardeners who work with the weather, not against it. Here's how to stay in step this month in St. Landry Parish, Louisiana.
Blackberries are vigorous bramble fruits that produce sweet-tart berries on thorny or thornless canes. They are prolific producers and relatively low-maintenance once established.
St. Landry Parish, Louisiana is in USDA Zone 9a. The average last spring frost is February 19 and the first fall frost is December 1, giving you a growing season of approximately 285 days.
At an elevation of 370 feet, St. Landry Parish receives approximately 59.8 inches of rainfall annually with predominantly sandy loam soil. Summer highs average 97°F, so Blackberries may need afternoon shade and extra watering during peak heat. Sandy soil warms quickly in spring — great for early planting — but Blackberries will need more frequent watering and organic matter to retain nutrients. Ample rainfall means less supplemental watering, but ensure good drainage to prevent Blackberries root diseases.
St. Landry Parish Soil Profile
Soil Type
Sandy Loam
Soil pH
4.8-6
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 St. Landry Parish
How your county's soil matches Blackberries's growing requirements.
Soil pH
Your soil pH (4.8–6.0) is more acidic than Blackberries prefers (5.5–7.0). Add garden lime to raise pH.
Soil Texture
Sandy soil in St. Landry Parish warms quickly in spring but drains fast. Blackberries will need more frequent watering and regular compost additions to retain nutrients.
Organic Matter
Organic matter is moderate (2.2%). Annual compost additions will help Blackberries.
How to Plant Blackberries
Plant Water Budget
Monthly Watering Guide for Blackberries
Blackberries needs approximately 1 inches of water per week (4.3" per month). Here's how your county's rainfall compares month by month.
| Month | Blackberries Needs | Rainfall | You Supplement | Action |
|---|---|---|---|---|
| Jan | — | 4.4" | 0" | ❄️ Dormant |
| Feb | 4.3" | 4.7" | 0" | ✅ Rainfall sufficient |
| Mar | 4.3" | 6" | 0" | ✅ Rainfall sufficient |
| Apr | 4.3" | 4.1" | 0.2" | 💧 Light watering |
| May | 4.3" | 4.6" | 0" | ✅ Rainfall sufficient |
| Jun | 4.3" | 4.7" | 0" | ✅ Rainfall sufficient |
| Jul | 4.3" | 7" | 0" | ✅ Rainfall sufficient |
| Aug | 4.3" | 6.4" | 0" | ✅ Rainfall sufficient |
| Sep | 4.3" | 4.1" | 0.2" | 💧 Light watering |
| Oct | 4.3" | 4.3" | 0" | ✅ Rainfall sufficient |
| Nov | 4.3" | 4" | 0.3" | 💧 Light watering |
| Dec | 4.3" | 5.6" | 0" | ✅ Rainfall sufficient |
Water needs are for active growing months only (Feb–Dec in St. Landry Parish). Supplement amounts are based on average rainfall — actual needs vary with temperature, soil, and mulching.
Blackberries 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.
Blackberries Planting Timeline — St. Landry Parish, LA
Blackberries Planting Calendar
| Activity | When | Date Range |
|---|---|---|
| Transplant Outdoors | March 5 | Mar 5 – Mar 19 |
· 24" apart · Rows 72" apart
Month-by-Month Timeline
| Month | Activities |
|---|---|
| January | — |
| February | — |
| March | Transplant Outdoors |
| April | — |
| May | — |
| June | — |
| July | — |
| August | — |
| September | — |
| October | — |
| November | — |
| December | — |
Growing Conditions
☀️ Sun
Full Sun (6-8+ hours)
💧 Water
1"/week · Only during dry spells
📅 Days to Maturity
365–730 days
🧪 Soil pH
Needs 5.5–7 · Your soil: too_acidic
🗺️ USDA Zone
Zone 9a
📆 Growing Season
285 days in St. Landry Parish
Growing Tips for Blackberries in St. Landry Parish
Direct sow Blackberries outdoors after February 19 in St. Landry Parish when soil has warmed and frost danger has passed.
Sandy soil in St. Landry Parish dries quickly — mulch Blackberries with 2-3 inches of straw and water deeply 2-3 times per week rather than lightly every day.
With summer highs reaching 97°F in St. Landry Parish, provide afternoon shade for Blackberries and water deeply in the morning.
Your 286.0-day growing season in St. Landry Parish is tight for Blackberries (365.0-730.0 days to maturity). Start indoors and choose early-maturing varieties.
General growing tips
Plant bare-root canes in spring. Provide a sturdy trellis system. Prune out spent fruiting canes after harvest. New canes fruit in their second year (floricanes).
Companion Planting
Good Companions
Avoid Planting Near
Check more plant combinations with our Companion Planting Checker →
Blackberries in Other Locations
Frequently Asked Questions
When should I plant Blackberries in St. Landry Parish, LA?
St. Landry Parish is in Zone 9a with an average last frost of February 19. Plan your Blackberries planting based on this frost date — see the calendar above for exact timing.
What planting zone is St. Landry Parish, LA?
St. Landry Parish, Louisiana is in USDA Hardiness Zone 9a. The average last spring frost is February 19 and first fall frost is December 1.
Your St. Landry Parish Garden Planner — Free
A 24-page printable planner built for St. Landry 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.