When to Plant Lavender in Guadalupe County, TX
May to-do list for Guadalupe County, Texas
Your Guadalupe County, Texas garden is entering a new phase. Here's what's on the schedule for May and why each task matters now.
Before June arrives, get these ready
- 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.
Guadalupe County, Texas is in USDA Zone 9a. The average last spring frost is March 7 and the first fall frost is November 21, giving you a growing season of approximately 259 days.
At an elevation of 3,679 feet, Guadalupe County receives approximately 63 inches of rainfall annually with predominantly clay soil. Summer highs average 93°F, providing good warmth for Lavender during the growing season. Clay soil retains moisture well for Lavender, but amend with compost to improve drainage and prevent root rot. Ample rainfall means less supplemental watering, but ensure good drainage to prevent Lavender root diseases.
Guadalupe County Soil Profile
Soil Type
Clay
Soil pH
6.9-8.2
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 Guadalupe County
How your county's soil matches Lavender's growing requirements.
Soil pH
Your soil pH (6.9–8.2) overlaps with Lavender's range (6.5–8.0), though not a perfect match.
Soil Texture
Your clay soil in Guadalupe County is workable for Lavender. Add compost annually to improve structure.
Organic Matter
Organic matter is moderate (2.7%). Annual compost additions will help Lavender.
How to Plant Lavender
Plant Water Budget
Water stress score is 6/10 — consider drought-tolerant varieties and mulching
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 | — | 1.6" | 0" | ❄️ Dormant |
| Feb | — | 2.1" | 0" | ❄️ Dormant |
| Mar | 1.3" | 4.4" | 0" | ✅ Rainfall sufficient |
| Apr | 1.3" | 6.5" | 0" | ✅ Rainfall sufficient |
| May | 1.3" | 9.5" | 0" | ✅ Rainfall sufficient |
| Jun | 1.3" | 9.3" | 0" | ✅ Rainfall sufficient |
| Jul | 1.3" | 8" | 0" | ✅ Rainfall sufficient |
| Aug | 1.3" | 7.1" | 0" | ✅ Rainfall sufficient |
| Sep | 1.3" | 6.4" | 0" | ✅ Rainfall sufficient |
| Oct | 1.3" | 4.5" | 0" | ✅ Rainfall sufficient |
| Nov | 1.3" | 1.9" | 0" | ✅ Rainfall sufficient |
| Dec | — | 1.6" | 0" | ❄️ Dormant |
Water needs are for active growing months only (Mar–Nov in Guadalupe 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 — Guadalupe County, TX
Lavender Planting Calendar
| Activity | When | Date Range |
|---|---|---|
| Transplant Outdoors | March 14 | Mar 14 – Mar 28 |
| Harvest | June 13 | Jun 13 – Nov 14 |
Plant 0.5" deep · 8" apart · Rows 12" apart
Month-by-Month Timeline
| Month | Activities |
|---|---|
| January | — |
| February | — |
| March | Transplant Outdoors |
| April | — |
| 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: acceptable
🗺️ USDA Zone
Zone 9a
📆 Growing Season
259 days in Guadalupe County
Growing Tips for Lavender in Guadalupe County
Direct sow Lavender outdoors after March 07 in Guadalupe County when soil has warmed and frost danger has passed.
With Guadalupe County's clay soil (40% clay), work in 3-4 inches of compost before planting Lavender. Avoid tilling when soil is wet to prevent compaction.
With 63" of annual rainfall in Guadalupe County, ensure good drainage for Lavender — excess moisture can promote root rot and fungal diseases.
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 Guadalupe County, TX?
Guadalupe County is in Zone 9a with an average last frost of March 7. Plan your Lavender planting based on this frost date — see the calendar above for exact timing.
What planting zone is Guadalupe County, TX?
Guadalupe County, Texas is in USDA Hardiness Zone 9a. The average last spring frost is March 7 and first fall frost is November 21.
Your Guadalupe County Garden Planner — Free
A 24-page printable planner built for Guadalupe 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.