When to Plant Celtuce in San Benito County, CA
Celtuce (stem lettuce) is a Chinese vegetable grown for its thick, crunchy stem rather than its leaves. The peeled stem has a mild, cucumber-like flavor.
San Benito County, California is in USDA Zone 9a. The average last spring frost is February 21 and the first fall frost is November 29, giving you a growing season of approximately 281 days.
At an elevation of 149 feet, San Benito County receives approximately 13 inches of rainfall annually with predominantly loam soil. Summer highs average 94°F, providing good warmth for Celtuce during the growing season. With low rainfall, drip irrigation is essential for growing Celtuce successfully. Mulch heavily to conserve soil moisture.
San Benito County Soil Profile
Soil Type
Loam
Soil pH
6.5-7.4
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 San Benito County
How your county's soil matches Celtuce's growing requirements.
Soil pH
Your soil pH (6.5–7.4) overlaps with Celtuce's range (6.0–7.0), though not a perfect match.
Soil Texture
The loam soil in San Benito County is excellent for Celtuce — good drainage, moisture retention, and nutrient holding capacity.
Organic Matter
Organic matter is moderate (2.7%). Annual compost additions will help Celtuce.
How to Plant Celtuce
Fall planting: Sow 8 weeks before your first frost date for a fall harvest.
Succession Planting Celtuce
Sow every 6.9 weeks. Last sowing by Aug 31 to harvest before frost.
For a dedicated fall crop, sow by Oct 04.
Plant Water Budget
Water stress score is 10/10 — consider drought-tolerant varieties and mulching
Monthly Watering Guide for Celtuce
Celtuce needs approximately 0.7 inches of water per week (3" per month). Here's how your county's rainfall compares month by month.
| Month | Celtuce Needs | Rainfall | You Supplement | Action |
|---|---|---|---|---|
| Jan | — | 2.5" | 0" | ❄️ Dormant |
| Feb | 3" | 2.6" | 0.4" | 💧 Light watering |
| Mar | 3" | 2.2" | 0.8" | 💧 Light watering |
| Apr | 3" | 1.1" | 1.9" | 🚿 Regular watering |
| May | 3" | 0.3" | 2.7" | 🚿 Regular watering |
| Jun | 3" | 0.1" | 2.9" | 🚿 Regular watering |
| Jul | 3" | 0" | 3" | 🚿 Regular watering |
| Aug | 3" | 0" | 3" | 🚿 Regular watering |
| Sep | 3" | 0.1" | 2.9" | 🚿 Regular watering |
| Oct | 3" | 0.5" | 2.5" | 🚿 Regular watering |
| Nov | 3" | 1.3" | 1.7" | 🚿 Regular watering |
| Dec | — | 2.3" | 0" | ❄️ Dormant |
Water needs are for active growing months only (Feb–Nov in San Benito County). Supplement amounts are based on average rainfall — actual needs vary with temperature, soil, and mulching.
Celtuce 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.
Celtuce Planting Timeline — San Benito County, CA
Celtuce Planting Calendar
| Activity | When | Date Range |
|---|---|---|
| Start Indoors | January 24 | Jan 24 – Feb 7 |
| Transplant Outdoors | February 21 | Feb 21 – Mar 7 |
| Direct Sow | January 31 | Jan 31 – Feb 21 |
| Harvest | April 25 | Apr 25 – Jun 6 |
| Fall Sowing | October 4 | Oct 4 – Oct 18 |
Plant 0.5" deep · 6" apart · Rows 12" apart
Month-by-Month Timeline
| Month | Activities |
|---|---|
| January | Start Indoors Direct Sow |
| February | Start Indoors Transplant Outdoors Direct Sow |
| March | Transplant Outdoors |
| April | Harvest |
| May | Harvest |
| June | Harvest |
| July | — |
| August | — |
| September | — |
| October | Fall Sowing |
| November | — |
| December | — |
Growing Conditions
☀️ Sun
Full Sun (6-8+ hours)
💧 Water
0.7"/week · 1-2 times/week
📅 Days to Maturity
60–90 days
🧪 Soil pH
Needs 6–7 · Your soil: acceptable
🗺️ USDA Zone
Zone 9a
📆 Growing Season
281 days in San Benito County
Growing Tips for Celtuce in San Benito County
Direct sow Celtuce outdoors after February 21 in San Benito County when soil has warmed and frost danger has passed.
Common pests for Celtuce in this region include aphids and slugs. Use row covers early in the season and inspect plants weekly.
General growing tips
Direct sow in spring or start indoors. Space 12 inches apart. Harvest when stems are about 1 inch in diameter. Peel the tough outer skin to reveal the tender center.
Companion Planting
Good Companions
Check more plant combinations with our Companion Planting Checker →
Celtuce in Other Locations
Frequently Asked Questions
When should I plant Celtuce in San Benito County, CA?
San Benito County is in Zone 9a with an average last frost of February 21. Plan your Celtuce planting based on this frost date — see the calendar above for exact timing.
What planting zone is San Benito County, CA?
San Benito County, California is in USDA Hardiness Zone 9a. The average last spring frost is February 21 and first fall frost is November 29.
Plan Your Garden with Confidence
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