When to Plant Mustard Greens in San Patricio County, TX
Top priorities for San Patricio County, Texas gardeners in May
Each item below is timed to San Patricio County, Texas's frost dates and soil temperatures. Skip nothing, stress about nothing.
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Harvest mustard greens as they ripen
Taste as you pick. The first ripe produce is the best feedback loop you'll get all season.
Mustard greens are fast-growing brassicas with a spicy, peppery kick. They come in green, red, and purple varieties and are excellent cooked or in salads.
San Patricio County, Texas is in USDA Zone 9b. The average last spring frost is February 12 and the first fall frost is December 9, giving you a growing season of approximately 300 days.
At an elevation of 2,449 feet, San Patricio County receives approximately 54.7 inches of rainfall annually with predominantly loam soil. Summer highs average 100°F, so Mustard Greens may need afternoon shade and extra watering during peak heat. Ample rainfall means less supplemental watering, but ensure good drainage to prevent Mustard Greens root diseases.
San Patricio County Soil Profile
Soil Type
Loam
Soil pH
6.8-7.2
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 San Patricio County
How your county's soil matches Mustard Greens's growing requirements.
Soil pH
Your soil pH (6.8–7.2) overlaps with Mustard Greens's range (6.0–7.0), though not a perfect match.
Soil Texture
The loam soil in San Patricio County is excellent for Mustard Greens — good drainage, moisture retention, and nutrient holding capacity.
Organic Matter
Organic matter is low (1.9%). Add 2-3 inches of compost before planting Mustard Greens.
How to Plant Mustard Greens
Fall planting: Sow 8 weeks before your first frost date for a fall harvest.
Succession Planting Mustard Greens
Sow every 3.4 weeks. Last sowing by Oct 20 to harvest before frost.
For a dedicated fall crop, sow by Oct 14.
Plant Water Budget
Monthly Watering Guide for Mustard Greens
Mustard Greens needs approximately 0.7 inches of water per week (3" per month). Here's how your county's rainfall compares month by month.
| Month | Mustard Greens Needs | Rainfall | You Supplement | Action |
|---|---|---|---|---|
| Jan | — | 1.5" | 0" | ❄️ Dormant |
| Feb | 3" | 1.7" | 1.3" | 💧 Light watering |
| Mar | 3" | 3.8" | 0" | ✅ Rainfall sufficient |
| Apr | 3" | 6.4" | 0" | ✅ Rainfall sufficient |
| May | 3" | 8.5" | 0" | ✅ Rainfall sufficient |
| Jun | 3" | 8.1" | 0" | ✅ Rainfall sufficient |
| Jul | 3" | 7.5" | 0" | ✅ Rainfall sufficient |
| Aug | 3" | 5.6" | 0" | ✅ Rainfall sufficient |
| Sep | 3" | 5" | 0" | ✅ Rainfall sufficient |
| Oct | 3" | 3.1" | 0" | ✅ Rainfall sufficient |
| Nov | 3" | 2" | 1" | 💧 Light watering |
| Dec | 3" | 1.4" | 1.6" | 🚿 Regular watering |
Water needs are for active growing months only (Feb–Dec in San Patricio County). Supplement amounts are based on average rainfall — actual needs vary with temperature, soil, and mulching.
Mustard Greens 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.
Mustard Greens Planting Timeline — San Patricio County, TX
Mustard Greens Planting Calendar
| Activity | When | Date Range |
|---|---|---|
| Start Indoors | January 15 | Jan 15 – Jan 29 |
| Transplant Outdoors | February 12 | Feb 12 – Feb 26 |
| Direct Sow | January 22 | Jan 22 – Feb 12 |
| Harvest | March 19 | Mar 19 – May 21 |
| Fall Sowing | October 14 | Oct 14 – Oct 28 |
Plant 0.5" deep · 6" apart · Rows 12" apart
Month-by-Month Timeline
| Month | Activities |
|---|---|
| January | Start Indoors Direct Sow |
| February | Transplant Outdoors Direct Sow |
| March | Harvest |
| April | Harvest |
| May | Harvest |
| June | — |
| July | — |
| August | — |
| September | — |
| October | Fall Sowing |
| November | — |
| December | — |
Growing Conditions
☀️ Sun
Partial Shade (3-6 hours)
💧 Water
0.7"/week · Natural rainfall sufficient
📅 Days to Maturity
30–50 days
🧪 Soil pH
Needs 6–7 · Your soil: acceptable
🗺️ USDA Zone
Zone 9b
📆 Growing Season
300 days in San Patricio County
Growing Tips for Mustard Greens in San Patricio County
Direct sow Mustard Greens outdoors after February 12 in San Patricio County when soil has warmed and frost danger has passed.
With summer highs reaching 100°F in San Patricio County, provide afternoon shade for Mustard Greens and water deeply in the morning.
Your generous 301.0-day season in San Patricio County allows multiple plantings of Mustard Greens. Sow every 15.0 days for continuous harvest.
Common pests for Mustard Greens in this region include cabbage worm and flea beetles. Use row covers early in the season and inspect plants weekly.
General growing tips
Direct sow in early spring or fall. Harvest young leaves for milder flavor. Plants bolt quickly in heat so grow as a cool-season crop or provide shade.
Companion Planting
Good Companions
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Mustard Greens in Other Locations
Frequently Asked Questions
When should I plant Mustard Greens in San Patricio County, TX?
San Patricio County is in Zone 9b with an average last frost of February 12. Plan your Mustard Greens planting based on this frost date — see the calendar above for exact timing.
What planting zone is San Patricio County, TX?
San Patricio County, Texas is in USDA Hardiness Zone 9b. The average last spring frost is February 12 and first fall frost is December 9.
Your San Patricio County Garden Planner — Free
A 24-page printable planner built for San Patricio County (Zone 9b). Planting dates, a month-by-month schedule, harvest log, seed inventory, and succession charts — all dialed in for your exact growing season.