When to Plant Rosemary in Grimes County, TX
Rosemary is an aromatic evergreen shrub with needle-like leaves and a piney, citrus flavor. It is a Mediterranean herb that thrives in warm, dry conditions.
Grimes County, Texas is in USDA Zone 8b. The average last spring frost is February 25 and the first fall frost is December 1, giving you a growing season of approximately 279 days.
At an elevation of 33 feet, Grimes County receives approximately 65.2 inches of rainfall annually with predominantly sandy loam soil. Summer highs average 91°F, providing good warmth for Rosemary during the growing season. Sandy soil warms quickly in spring — great for early planting — but Rosemary will need more frequent watering and organic matter to retain nutrients. Ample rainfall means less supplemental watering, but ensure good drainage to prevent Rosemary root diseases.
Grimes County Soil Profile
Soil Type
Sandy Loam
Soil pH
5.8-6.5
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 Grimes County
How your county's soil matches Rosemary's growing requirements.
Soil pH
Your soil pH (5.8–6.5) overlaps with Rosemary's range (6.0–7.5), though not a perfect match.
Soil Texture
Sandy soil in Grimes County warms quickly in spring but drains fast. Rosemary will need more frequent watering and regular compost additions to retain nutrients.
Drainage
Drainage is adequate for Rosemary.
Organic Matter
Organic matter is low (1.7%). Add 2-3 inches of compost before planting Rosemary.
How to Plant Rosemary
Succession Planting Rosemary
Sow every 9.1 weeks. Last sowing by Jun 04 to harvest before frost.
Plant Water Budget
Water stress score is 6/10 — consider drought-tolerant varieties and mulching
Monthly Watering Guide for Rosemary
Rosemary needs approximately 0.3 inches of water per week (1.3" per month). Here's how your county's rainfall compares month by month.
| Month | Rosemary Needs | Rainfall | You Supplement | Action |
|---|---|---|---|---|
| Jan | — | 1.9" | 0" | ❄️ Dormant |
| Feb | 1.3" | 2.1" | 0" | ✅ Rainfall sufficient |
| Mar | 1.3" | 4.7" | 0" | ✅ Rainfall sufficient |
| Apr | 1.3" | 6" | 0" | ✅ Rainfall sufficient |
| May | 1.3" | 9.9" | 0" | ✅ Rainfall sufficient |
| Jun | 1.3" | 9.9" | 0" | ✅ Rainfall sufficient |
| Jul | 1.3" | 8.3" | 0" | ✅ Rainfall sufficient |
| Aug | 1.3" | 8.3" | 0" | ✅ Rainfall sufficient |
| Sep | 1.3" | 6.6" | 0" | ✅ Rainfall sufficient |
| Oct | 1.3" | 3.9" | 0" | ✅ Rainfall sufficient |
| Nov | 1.3" | 2" | 0" | ✅ Rainfall sufficient |
| Dec | 1.3" | 1.7" | 0" | ✅ Rainfall sufficient |
Water needs are for active growing months only (Feb–Dec in Grimes County). Supplement amounts are based on average rainfall — actual needs vary with temperature, soil, and mulching.
Rosemary 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.
Rosemary Planting Timeline — Grimes County, TX
Rosemary Planting Calendar
| Activity | When | Date Range |
|---|---|---|
| Transplant Outdoors | March 4 | Mar 4 – Mar 18 |
| Harvest | May 27 | May 27 – Oct 14 |
Plant 0.5" deep · 8" apart · Rows 12" apart
Month-by-Month Timeline
| Month | Activities |
|---|---|
| January | — |
| February | — |
| March | Transplant Outdoors |
| April | — |
| May | Harvest |
| June | Harvest |
| July | Harvest |
| August | Harvest |
| September | Harvest |
| October | Harvest |
| November | — |
| December | — |
Growing Conditions
☀️ Sun
Full Sun (6-8+ hours)
💧 Water
0.3"/week · Natural rainfall sufficient
📅 Days to Maturity
80–180 days
🧪 Soil pH
Needs 6–7.5 · Your soil: acceptable
🗺️ USDA Zone
Zone 8b
📆 Growing Season
279 days in Grimes County
Growing Tips for Rosemary in Grimes County
Direct sow Rosemary outdoors after February 25 in Grimes County when soil has warmed and frost danger has passed.
Sandy soil in Grimes County dries quickly — mulch Rosemary with 2-3 inches of straw and water deeply 2-3 times per week rather than lightly every day.
With 65" of annual rainfall in Grimes County, ensure good drainage for Rosemary — excess moisture can promote root rot and fungal diseases.
General growing tips
Grow in well-drained soil and avoid overwatering. In cold climates, grow in containers and bring indoors for winter. Propagate from stem cuttings for faster results than seed.
Companion Planting
Good Companions
Check more plant combinations with our Companion Planting Checker →
Rosemary in Other Locations
Frequently Asked Questions
When should I plant Rosemary in Grimes County, TX?
Grimes County is in Zone 8b with an average last frost of February 25. Plan your Rosemary planting based on this frost date — see the calendar above for exact timing.
What planting zone is Grimes County, TX?
Grimes County, Texas is in USDA Hardiness Zone 8b. The average last spring frost is February 25 and first fall frost is December 1.
Plan Your Garden with Confidence
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