When to Plant Watercress in Grant Parish, LA
May to-do list for Grant Parish, Louisiana
If you only do a handful of things in the garden this May, make it these. They're sequenced around your zone's frost timing.
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Basket week: watercress
Morning harvests are best — cooler temperatures mean crisper produce and longer fridge life.
Watercress is a semi-aquatic plant with a peppery, tangy flavor rich in vitamins and minerals. It grows naturally along streams and can be cultivated in containers with standing water.
Grant Parish, Louisiana is in USDA Zone 9a. The average last spring frost is March 3 and the first fall frost is November 19, giving you a growing season of approximately 261 days.
At an elevation of 356 feet, Grant Parish receives approximately 56.8 inches of rainfall annually with predominantly loam soil. Summer highs average 92°F, providing good warmth for Watercress during the growing season. Ample rainfall means less supplemental watering, but ensure good drainage to prevent Watercress root diseases.
Grant Parish Soil Profile
Soil Type
Loam
Soil pH
6.1-7.3
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 Grant Parish
How your county's soil matches Watercress's growing requirements.
Soil pH
Your soil pH (6.1–7.3) overlaps with Watercress's range (6.5–7.5), though not a perfect match.
Soil Texture
The loam soil in Grant Parish is excellent for Watercress — good drainage, moisture retention, and nutrient holding capacity.
Organic Matter
Organic matter is moderate (2.8%). Annual compost additions will help Watercress.
How to Plant Watercress
Fall planting: Sow 8 weeks before your first frost date for a fall harvest.
Succession Planting Watercress
Sow every 4.6 weeks. Last sowing by Sep 20 to harvest before frost.
For a dedicated fall crop, sow by Sep 24.
Plant Water Budget
Monthly Watering Guide for Watercress
Watercress needs approximately 1.5 inches of water per week (6.5" per month). Here's how your county's rainfall compares month by month.
| Month | Watercress Needs | Rainfall | You Supplement | Action |
|---|---|---|---|---|
| Jan | — | 5" | 0" | ❄️ Dormant |
| Feb | — | 4.2" | 0" | ❄️ Dormant |
| Mar | 6.5" | 6" | 0.5" | 💧 Light watering |
| Apr | 6.5" | 4.7" | 1.8" | 💧 Light watering |
| May | 6.5" | 4.8" | 1.7" | 💧 Light watering |
| Jun | 6.5" | 4.6" | 1.9" | 💧 Light watering |
| Jul | 6.5" | 6" | 0.5" | 💧 Light watering |
| Aug | 6.5" | 4.9" | 1.6" | 💧 Light watering |
| Sep | 6.5" | 4.4" | 2.1" | 💧 Light watering |
| Oct | 6.5" | 3.5" | 3" | 💧 Light watering |
| Nov | 6.5" | 4.2" | 2.3" | 💧 Light watering |
| Dec | — | 4.4" | 0" | ❄️ Dormant |
Water needs are for active growing months only (Mar–Nov in Grant Parish). Supplement amounts are based on average rainfall — actual needs vary with temperature, soil, and mulching.
Watercress 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.
Watercress Planting Timeline — Grant Parish, LA
Watercress Planting Calendar
| Activity | When | Date Range |
|---|---|---|
| Start Indoors | February 3 | Feb 3 – Feb 17 |
| Transplant Outdoors | March 3 | Mar 3 – Mar 17 |
| Direct Sow | February 10 | Feb 10 – Mar 3 |
| Harvest | April 14 | Apr 14 – May 19 |
| Fall Sowing | September 24 | Sep 24 – Oct 8 |
Plant 0.5" deep · 6" apart · Rows 12" apart
Month-by-Month Timeline
| Month | Activities |
|---|---|
| January | — |
| February | Start Indoors Direct Sow |
| March | Transplant Outdoors Direct Sow |
| April | Harvest |
| May | Harvest |
| June | — |
| July | — |
| August | — |
| September | Fall Sowing |
| October | Fall Sowing |
| November | — |
| December | — |
Growing Conditions
☀️ Sun
Partial Shade (3-6 hours)
💧 Water
1.5"/week · 1-2 times/week
📅 Days to Maturity
40–60 days
🧪 Soil pH
Needs 6.5–7.5 · Your soil: acceptable
🗺️ USDA Zone
Zone 9a
📆 Growing Season
261 days in Grant Parish
Growing Tips for Watercress in Grant Parish
Direct sow Watercress outdoors after March 03 in Grant Parish when soil has warmed and frost danger has passed.
Your generous 261.0-day season in Grant Parish allows multiple plantings of Watercress. Sow every 20.0 days for continuous harvest.
Common pests for Watercress in this region include cabbage worm and flea beetles. Use row covers early in the season and inspect plants weekly.
General growing tips
Grow in containers with trays of water kept fresh. Provide partial shade and cool conditions. Harvest stems by cutting above water level. Replace water frequently to prevent stagnation.
Companion Planting
Good Companions
Check more plant combinations with our Companion Planting Checker →
Watercress in Other Locations
Frequently Asked Questions
When should I plant Watercress in Grant Parish, LA?
Grant Parish is in Zone 9a with an average last frost of March 3. Plan your Watercress planting based on this frost date — see the calendar above for exact timing.
What planting zone is Grant Parish, LA?
Grant Parish, Louisiana is in USDA Hardiness Zone 9a. The average last spring frost is March 3 and first fall frost is November 19.
Your Grant Parish Garden Planner — Free
A 24-page printable planner built for Grant 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.