When to plant Calendula in Delaware County, IN
Plant Calendula in Delaware County from March 29 to April 19 in spring. Delaware County sits in USDA Zone 6a, with last frost around April 26 and first frost on October 16.
When to Plant Calendula in Delaware County, IN
June in Delaware County, Indiana — your action list
Your Delaware County, Indiana garden is entering a new phase. Here's what's on the schedule for June and why each task matters now.
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Indoor seed-starting week for calendula
Your window is short. These crops want several weeks of indoor growth before they go outside.
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Pick calendula
If you can't use it all right away, check the food-preservation section of your planner.
To set up a strong July, finish these tasks
- First harvests: calendula
Calendula (Calendula officinalis) is a cheerful, edible-flowered cool-season annual valued by herbalists, chefs, and gardeners alike. Its golden-orange petals are used in salves, teas, and as a saffron substitute. Hardy enough to tolerate light frosts, it blooms prolifically in spring and fall, taking a pause during the hottest weeks of summer.
Delaware County, Indiana is in USDA Zone 6a. The average last spring frost is April 26 and the first fall frost is October 16, giving you a growing season of approximately 173 days.
At an elevation of 739 feet, Delaware County receives approximately 31.1 inches of rainfall annually with predominantly silt loam soil. Summer highs average 83°F, so choose short-season varieties of Calendula to ensure they mature before fall.
Delaware County Soil Profile
Soil Type
Silt Loam
Soil pH
6-7
Drainage
Well Drained
Calendula 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 Delaware County
How your county's soil matches Calendula's growing requirements.
Soil pH
Your soil pH (6.0–7.0) is within Calendula's preferred range (5.5–7.0).
Soil Texture
The silt loam soil in Delaware County is excellent for Calendula — good drainage, moisture retention, and nutrient holding capacity.
Organic Matter
Organic matter is excellent (4.8%) — Calendula will thrive.
How to Plant Calendula
Succession Planting Calendula
Sow every 5.7 weeks. Last sowing by Aug 07 to harvest before frost.
Calendula Water Budget
Monthly Watering Guide for Calendula
Calendula needs approximately 0.5 inches of water per week (2.2" per month). Here's how your county's rainfall compares month by month.
| Month | Calendula Needs | Rainfall | You Supplement | Action |
|---|---|---|---|---|
| Jan | — | 1.3" | 0" | ❄️ Dormant |
| Feb | — | 1.5" | 0" | ❄️ Dormant |
| Mar | — | 2" | 0" | ❄️ Dormant |
| Apr | 2.2" | 3.1" | 0" | ✅ Rainfall sufficient |
| May | 2.2" | 3.6" | 0" | ✅ Rainfall sufficient |
| Jun | 2.2" | 3.7" | 0" | ✅ Rainfall sufficient |
| Jul | 2.2" | 3.6" | 0" | ✅ Rainfall sufficient |
| Aug | 2.2" | 3.5" | 0" | ✅ Rainfall sufficient |
| Sep | 2.2" | 2.4" | 0" | ✅ Rainfall sufficient |
| Oct | 2.2" | 2.5" | 0" | ✅ Rainfall sufficient |
| Nov | — | 2.4" | 0" | ❄️ Dormant |
| Dec | — | 1.5" | 0" | ❄️ Dormant |
Water needs are for active growing months only (Apr–Oct in Delaware County). Supplement amounts are based on average rainfall — actual needs vary with temperature, soil, and mulching.
Calendula 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.
Calendula Planting Timeline — Delaware County, IN
Calendula Planting Calendar
| Activity | When | Date Range |
|---|---|---|
| Start Indoors | March 15 | Mar 15 – Mar 29 |
| Transplant Outdoors | April 26 | Apr 26 – May 10 |
| Direct Sow | March 29 | Mar 29 – Apr 19 |
| Bloom | June 14 | Jun 14 – Sep 13 |
Plant 0.3" deep · 9" apart · Rows 12" apart
Month-by-Month Timeline
| Month | Activities |
|---|---|
| January | — |
| February | — |
| March | Start Indoors Direct Sow |
| April | Transplant Outdoors Direct Sow |
| May | Transplant Outdoors |
| June | Bloom |
| July | Bloom |
| August | Bloom |
| September | Bloom |
| October | — |
| November | — |
| December | — |
Growing Conditions
☀️ Sun
Full Sun (6-8+ hours)
💧 Water
0.5"/week · Natural rainfall sufficient
📅 Days to Maturity
50–70 days
🧪 Soil pH
Needs 5.5–7 · Your soil: ideal
🗺️ USDA Zone
Zone 6a
📆 Growing Season
173 days in Delaware County
Growing Tips for Calendula in Delaware County
Direct sow Calendula outdoors after April 26 in Delaware County when soil has warmed and frost danger has passed.
Common pests for Calendula in this region include aphids and slugs. Use row covers early in the season and inspect plants weekly.
General growing tips
Direct-sow in early spring as soon as soil can be worked — seeds germinate in cool soil (50-65°F). In zones 7+, also sow in fall for winter/spring bloom. Deadhead consistently to extend bloom. Plants self-seed readily; save a few spent heads and allow them to drop. Harvest petals when flowers are fully open for best flavor and medicinal value.
Companion Planting
Good Companions
Check more plant combinations with our Companion Planting Checker →
Calendula in Other Locations
Frequently Asked Questions
When should I plant Calendula in Delaware County, IN?
Delaware County is in Zone 6a with an average last frost of April 26. Plan your Calendula planting based on this frost date — see the calendar above for exact timing.
What planting zone is Delaware County, IN?
Delaware County, Indiana is in USDA Hardiness Zone 6a. The average last spring frost is April 26 and first fall frost is October 16.
When should I plant Calendula in Delaware County, IN?
In Delaware County, IN, plant Calendula after the last frost (around April 26) and before the first frost (around October 16). Best results when soil holds above 50°F.
What growing zone is Delaware County, IN for Calendula?
Delaware County sits in USDA Zone 6a. Calendula grows reliably in zones 2a through 11b, so it's a good fit here.
Can Calendula grow in Delaware County's climate?
Yes — Calendula grows well in Delaware County's temperate climate. Delaware County averages a 173-day frost-free season, with last frost around April 26 and first frost around October 16.
Your Delaware County Garden Planner — Free
A 22-page printable planner built for Delaware 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.