When to plant Calendula in Washington County, KY
The best window to plant Calendula in Washington County, is March 4–March 25, when soil warms to 50°F. Last frost typically hits April 8; first frost October 29. A second sowing from September 3 to September 17 extends the harvest into fall.
When to Plant Calendula in Washington County, KY
Your August game plan for Washington County, Kentucky
Your Washington County, Kentucky garden is entering a new phase. Here's what's on the schedule for August and why each task matters now.
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Basket week: calendula
This is the payoff month. Bring a basket, bring a friend, and get into the beds.
September will be here before you know it — start on
- First harvests: calendula
- Fall sowing: 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.
Washington County, Kentucky is in USDA Zone 7a. The average last spring frost is April 8 and the first fall frost is October 29, giving you a growing season of approximately 204 days.
At an elevation of 2,281 feet, Washington County receives approximately 43.1 inches of rainfall annually with predominantly silt loam soil. Summer highs average 91°F, providing good warmth for Calendula during the growing season.
Washington County Soil Profile
Soil Type
Silt Loam
Soil pH
5.3-7
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 Washington County
How your county's soil matches Calendula's growing requirements.
Soil pH
Your soil pH (5.3–7.0) overlaps with Calendula's range (5.5–7.0), though not a perfect match.
Soil Texture
The silt loam soil in Washington County is excellent for Calendula — good drainage, moisture retention, and nutrient holding capacity.
Organic Matter
Organic matter is moderate (3.1%). 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 20 to harvest before frost.
For a dedicated fall crop, sow by Sep 03.
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 | — | 3.3" | 0" | ❄️ Dormant |
| Feb | — | 3.2" | 0" | ❄️ Dormant |
| Mar | — | 4.1" | 0" | ❄️ Dormant |
| Apr | 2.2" | 3.4" | 0" | ✅ Rainfall sufficient |
| May | 2.2" | 3.5" | 0" | ✅ Rainfall sufficient |
| Jun | 2.2" | 4.3" | 0" | ✅ Rainfall sufficient |
| Jul | 2.2" | 4.6" | 0" | ✅ Rainfall sufficient |
| Aug | 2.2" | 4" | 0" | ✅ Rainfall sufficient |
| Sep | 2.2" | 3.7" | 0" | ✅ Rainfall sufficient |
| Oct | 2.2" | 2.7" | 0" | ✅ Rainfall sufficient |
| Nov | — | 3" | 0" | ❄️ Dormant |
| Dec | — | 3.5" | 0" | ❄️ Dormant |
Water needs are for active growing months only (Apr–Oct in Washington 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 — Washington County, KY
Calendula Planting Calendar
| Activity | When | Date Range |
|---|---|---|
| Start Indoors | February 25 | Feb 25 – Mar 11 |
| Transplant Outdoors | April 8 | Apr 8 – Apr 22 |
| Direct Sow | March 4 | Mar 4 – Mar 25 |
| Bloom | May 27 | May 27 – Sep 9 |
| Fall Sowing | September 3 | Sep 3 – Sep 17 |
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 | 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
204 days in Washington County
Growing Tips for Calendula in Washington County
Direct sow Calendula outdoors after April 08 in Washington 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 Washington County, KY?
Washington County is in Zone 7a with an average last frost of April 8. Plan your Calendula planting based on this frost date — see the calendar above for exact timing.
What planting zone is Washington County, KY?
Washington County, Kentucky is in USDA Hardiness Zone 7a. The average last spring frost is April 8 and first fall frost is October 29.
When should I plant Calendula in Washington County, KY?
In Washington County, KY, plant Calendula after the last frost (around April 8) and before the first frost (around October 29). Best results when soil holds above 50°F.
What growing zone is Washington County, KY for Calendula?
Washington 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 Washington County's climate?
Yes — Calendula grows well in Washington County's temperate climate. Washington County averages a 204-day frost-free season, with last frost around April 8 and first frost around October 29.
Your Washington County Garden Planner — Free
A 22-page printable planner built for Washington 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.