When to Plant Lavender in Putnam County, IN
Putnam County, Indiana gardeners: here's your May plan
Here's what deserves your attention in Putnam County, Indiana this month. Everything below is tailored to Zone 6a and timed around your local frost dates.
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.
Putnam County, Indiana is in USDA Zone 6a. The average last spring frost is April 14 and the first fall frost is October 21, giving you a growing season of approximately 190 days.
At an elevation of 670 feet, Putnam County receives approximately 31.4 inches of rainfall annually with predominantly silt loam soil. Summer highs average 88°F, providing good warmth for Lavender during the growing season.
Putnam County Soil Profile
Soil Type
Silt Loam
Soil pH
6-7.2
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 Putnam County
How your county's soil matches Lavender's growing requirements.
Soil pH
Your soil pH (6.0–7.2) overlaps with Lavender's range (6.5–8.0), though not a perfect match.
Soil Texture
The silt loam soil in Putnam County is excellent for Lavender — good drainage, moisture retention, and nutrient holding capacity.
Drainage
Drainage is adequate for Lavender.
Organic Matter
Organic matter is excellent (4.3%) — Lavender will thrive.
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 | — | 1.3" | 0" | ❄️ Dormant |
| Feb | — | 1.4" | 0" | ❄️ Dormant |
| Mar | — | 2.2" | 0" | ❄️ Dormant |
| Apr | 1.3" | 2.7" | 0" | ✅ Rainfall sufficient |
| May | 1.3" | 3.7" | 0" | ✅ Rainfall sufficient |
| Jun | 1.3" | 4.2" | 0" | ✅ Rainfall sufficient |
| Jul | 1.3" | 3.7" | 0" | ✅ Rainfall sufficient |
| Aug | 1.3" | 2.9" | 0" | ✅ Rainfall sufficient |
| Sep | 1.3" | 2.5" | 0" | ✅ Rainfall sufficient |
| Oct | 1.3" | 2.8" | 0" | ✅ Rainfall sufficient |
| Nov | — | 2.1" | 0" | ❄️ Dormant |
| Dec | — | 1.9" | 0" | ❄️ Dormant |
Water needs are for active growing months only (Apr–Oct in Putnam 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 — Putnam County, IN
Lavender Planting Calendar
| Activity | When | Date Range |
|---|---|---|
| Transplant Outdoors | April 21 | Apr 21 – May 5 |
| Harvest | July 21 | Jul 21 – Nov 3 |
Plant 0.5" deep · 8" apart · Rows 12" apart
Month-by-Month Timeline
| Month | Activities |
|---|---|
| January | — |
| February | — |
| March | — |
| April | Transplant Outdoors |
| May | Transplant Outdoors |
| June | — |
| 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 6a
📆 Growing Season
190 days in Putnam County
Growing Tips for Lavender in Putnam County
Direct sow Lavender outdoors after April 14 in Putnam County when soil has warmed and frost danger has passed.
Your 190.0-day growing season in Putnam County is tight for Lavender (90.0-200.0 days to maturity). Start indoors and choose early-maturing varieties.
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 Putnam County, IN?
Putnam County is in Zone 6a with an average last frost of April 14. Plan your Lavender planting based on this frost date — see the calendar above for exact timing.
What planting zone is Putnam County, IN?
Putnam County, Indiana is in USDA Hardiness Zone 6a. The average last spring frost is April 14 and first fall frost is October 21.
Your Putnam County Garden Planner — Free
A 24-page printable planner built for Putnam County (Zone 6a). Planting dates, a month-by-month schedule, harvest log, seed inventory, and succession charts — all dialed in for your exact growing season.