When to Plant Lavender in Bexar County, TX
May in Bexar County, Texas — your action list
Welcome to May in Zone 9a. These are the moves that will have the biggest impact on your growing season.
Looking ahead to June
- First harvests: lavender
Lavender is a fragrant perennial herb with silvery foliage and purple flower spikes. It is prized for its essential oils, culinary uses, and ornamental beauty.
Bexar County, Texas is in USDA Zone 9a. The average last spring frost is March 11 and the first fall frost is November 17, giving you a growing season of approximately 251 days.
At an elevation of 3,197 feet, Bexar County receives approximately 52.1 inches of rainfall annually with predominantly loam soil. Summer highs average 93°F, providing good warmth for Lavender during the growing season. Ample rainfall means less supplemental watering, but ensure good drainage to prevent Lavender root diseases.
Bexar County Soil Profile
Soil Type
Loam
Soil pH
6.5-7.8
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 Bexar County
How your county's soil matches Lavender's growing requirements.
Soil pH
Your soil pH (6.5–7.8) is within Lavender's preferred range (6.5–8.0).
Soil Texture
The loam soil in Bexar County is excellent for Lavender — good drainage, moisture retention, and nutrient holding capacity.
Organic Matter
Organic matter is moderate (2.2%). Annual compost additions will help Lavender.
How to Plant Lavender
Plant Water Budget
Monthly Watering Guide for Lavender
Lavender 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 | Lavender Needs | Rainfall | You Supplement | Action |
|---|---|---|---|---|
| Jan | — | 1.4" | 0" | ❄️ Dormant |
| Feb | — | 1.7" | 0" | ❄️ Dormant |
| Mar | 1.3" | 3.6" | 0" | ✅ Rainfall sufficient |
| Apr | 1.3" | 5.6" | 0" | ✅ Rainfall sufficient |
| May | 1.3" | 7.5" | 0" | ✅ Rainfall sufficient |
| Jun | 1.3" | 8.2" | 0" | ✅ Rainfall sufficient |
| Jul | 1.3" | 6.3" | 0" | ✅ Rainfall sufficient |
| Aug | 1.3" | 6.3" | 0" | ✅ Rainfall sufficient |
| Sep | 1.3" | 4.9" | 0" | ✅ Rainfall sufficient |
| Oct | 1.3" | 3.5" | 0" | ✅ Rainfall sufficient |
| Nov | 1.3" | 1.9" | 0" | ✅ Rainfall sufficient |
| Dec | — | 1.3" | 0" | ❄️ Dormant |
Water needs are for active growing months only (Mar–Nov in Bexar County). Supplement amounts are based on average rainfall — actual needs vary with temperature, soil, and mulching.
Lavender 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.
Lavender Planting Timeline — Bexar County, TX
Lavender Planting Calendar
| Activity | When | Date Range |
|---|---|---|
| Transplant Outdoors | March 18 | Mar 18 – Apr 1 |
| Harvest | June 17 | Jun 17 – Nov 18 |
Plant 0.5" deep · 8" apart · Rows 12" apart
Month-by-Month Timeline
| Month | Activities |
|---|---|
| January | — |
| February | — |
| March | Transplant Outdoors |
| April | Transplant Outdoors |
| May | — |
| June | Harvest |
| July | Harvest |
| August | Harvest |
| September | Harvest |
| October | Harvest |
| November | Harvest |
| December | — |
Growing Conditions
☀️ Sun
Full Sun (6-8+ hours)
💧 Water
0.3"/week · Natural rainfall sufficient
📅 Days to Maturity
90–200 days
🧪 Soil pH
Needs 6.5–8 · Your soil: ideal
🗺️ USDA Zone
Zone 9a
📆 Growing Season
251 days in Bexar County
Growing Tips for Lavender in Bexar County
Direct sow Lavender outdoors after March 11 in Bexar County when soil has warmed and frost danger has passed.
General growing tips
Plant in well-drained, sandy soil. Avoid heavy mulching around the crown. Prune after flowering but do not cut into old wood. Lavender resents wet winter conditions.
Companion Planting
Good Companions
Check more plant combinations with our Companion Planting Checker →
Lavender in Other Locations
Frequently Asked Questions
When should I plant Lavender in Bexar County, TX?
Bexar County is in Zone 9a with an average last frost of March 11. Plan your Lavender planting based on this frost date — see the calendar above for exact timing.
What planting zone is Bexar County, TX?
Bexar County, Texas is in USDA Hardiness Zone 9a. The average last spring frost is March 11 and first fall frost is November 17.
Your Bexar County Garden Planner — Free
A 24-page printable planner built for Bexar County (Zone 9a). Planting dates, a month-by-month schedule, harvest log, seed inventory, and succession charts — all dialed in for your exact growing season.