When to plant Calendula in Green County, KY
Green County sits in USDA Zone 7a. Plant Calendula between March 7 (after last frost on April 11) and March 28. A second sowing from August 31 to September 14 extends the harvest into fall.
When to Plant Calendula in Green County, KY
This month in Green County, Kentucky
Welcome to June in Zone 7a. These are the moves that will have the biggest impact on your growing season.
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It's harvest week for calendula
If you can't use it all right away, check the food-preservation section of your planner.
Before July arrives, get these ready
- 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.
Green County, Kentucky is in USDA Zone 7a. The average last spring frost is April 11 and the first fall frost is October 26, giving you a growing season of approximately 198 days.
At an elevation of 3,262 feet, Green County receives approximately 50.7 inches of rainfall annually with predominantly silt loam soil. Summer highs average 91°F, providing good warmth for Calendula during the growing season. Ample rainfall means less supplemental watering, but ensure good drainage to prevent Calendula root diseases.
Green County Soil Profile
Soil Type
Silt Loam
Soil pH
5.3-6.5
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 Green County
How your county's soil matches Calendula's growing requirements.
Soil pH
Your soil pH (5.3–6.5) overlaps with Calendula's range (5.5–7.0), though not a perfect match.
Soil Texture
The silt loam soil in Green County is excellent for Calendula — good drainage, moisture retention, and nutrient holding capacity.
Organic Matter
Organic matter is moderate (2.7%). Annual compost additions will help Calendula.
How to Plant Calendula
Fall planting: Sow 8 weeks before your first frost date for a fall harvest.
Succession Planting Calendula
Sow every 5.7 weeks. Last sowing by Aug 17 to harvest before frost.
For a dedicated fall crop, sow by Aug 31.
Calendula Water Budget
Water stress score is 6/10 — consider drought-tolerant varieties and mulching
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 | — | 3.8" | 0" | ❄️ Dormant |
| Feb | — | 3.6" | 0" | ❄️ Dormant |
| Mar | — | 5.5" | 0" | ❄️ Dormant |
| Apr | 2.2" | 3.3" | 0" | ✅ Rainfall sufficient |
| May | 2.2" | 4.1" | 0" | ✅ Rainfall sufficient |
| Jun | 2.2" | 4.8" | 0" | ✅ Rainfall sufficient |
| Jul | 2.2" | 4.7" | 0" | ✅ Rainfall sufficient |
| Aug | 2.2" | 5.3" | 0" | ✅ Rainfall sufficient |
| Sep | 2.2" | 3.8" | 0" | ✅ Rainfall sufficient |
| Oct | 2.2" | 3.5" | 0" | ✅ Rainfall sufficient |
| Nov | — | 3.8" | 0" | ❄️ Dormant |
| Dec | — | 4.5" | 0" | ❄️ Dormant |
Water needs are for active growing months only (Apr–Oct in Green 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 — Green County, KY
Calendula Planting Calendar
| Activity | When | Date Range |
|---|---|---|
| Start Indoors | February 28 | Feb 28 – Mar 14 |
| Transplant Outdoors | April 11 | Apr 11 – Apr 25 |
| Direct Sow | March 7 | Mar 7 – Mar 28 |
| Bloom | May 30 | May 30 – Sep 12 |
| Fall Sowing | August 31 | Aug 31 – Sep 14 |
Plant 0.3" deep · 9" apart · Rows 12" apart
Month-by-Month Timeline
| Month | Activities |
|---|---|
| January | — |
| February | Start Indoors |
| March | Start Indoors Direct Sow |
| April | Transplant Outdoors |
| May | Bloom |
| June | Bloom |
| July | Bloom |
| August | Fall Sowing Bloom |
| September | Fall Sowing 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: acceptable
🗺️ USDA Zone
Zone 7a
📆 Growing Season
198 days in Green County
Growing Tips for Calendula in Green County
Direct sow Calendula outdoors after April 11 in Green 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 Green County, KY?
Green County is in Zone 7a with an average last frost of April 11. Plan your Calendula planting based on this frost date — see the calendar above for exact timing.
What planting zone is Green County, KY?
Green County, Kentucky is in USDA Hardiness Zone 7a. The average last spring frost is April 11 and first fall frost is October 26.
When should I plant Calendula in Green County, KY?
In Green County, KY, plant Calendula after the last frost (around April 11) and before the first frost (around October 26). Best results when soil holds above 50°F.
What growing zone is Green County, KY for Calendula?
Green County sits in USDA Zone 7a. Calendula grows reliably in zones 2a through 11b, so it's a good fit here.
Can Calendula grow in Green County's climate?
Yes — Calendula grows well in Green County's temperate climate. Green County averages a 198-day frost-free season, with last frost around April 11 and first frost around October 26.
Your Green County Garden Planner — Free
A 22-page printable planner built for Green County (Zone 7a). Planting dates, a month-by-month schedule, harvest log, seed inventory, and succession charts — all dialed in for your exact growing season.