When to plant Larkspur in Bourbon County County,
In Zone 7a (Bourbon County County), direct-sow Larkspur between March 11 and April 1 for spring, after the April 8 last-frost mark. A second sowing from August 16 to August 30 extends the harvest into fall.
When to Plant Larkspur in Bourbon County, KS
June to-do list for Bourbon County, Kansas
Your garden in Bourbon County, Kansas is working on a schedule, even when you're not. Here's where you should be this June.
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Start harvesting larkspur
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: larkspur
Larkspur (Consolida ajacis) is a cool-season annual that produces tall, delicate spires of blue, purple, pink, and white flowers reminiscent of its perennial cousin, delphinium. Direct-sown into cold soil or fall-sown in mild-winter climates, it blooms in spring before going to seed as summer heat arrives. An excellent cut flower and cottage-garden staple.
Bourbon County, Kansas is in USDA Zone 7a. The average last spring frost is April 8 and the first fall frost is October 25, giving you a growing season of approximately 200 days.
At an elevation of 438 feet, Bourbon County receives approximately 26 inches of rainfall annually with predominantly loam soil. Summer highs average 85°F, providing good warmth for Larkspur during the growing season.
Bourbon County Soil Profile
Soil Type
Loam
Soil pH
6.2-7.2
Drainage
Well Drained
Larkspur 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 Bourbon County
How your county's soil matches Larkspur's growing requirements.
Soil pH
Your soil pH (6.2–7.2) overlaps with Larkspur's range (6.0–7.0), though not a perfect match.
Soil Texture
The loam soil in Bourbon County is excellent for Larkspur — good drainage, moisture retention, and nutrient holding capacity.
Organic Matter
Organic matter is moderate (3.8%). Annual compost additions will help Larkspur.
How to Plant Larkspur
Fall planting: Sow 10 weeks before your first frost date for a fall harvest.
Succession Planting Larkspur
Sow every 6.9 weeks. Last sowing by Jul 27 to harvest before frost.
For a dedicated fall crop, sow by Aug 16.
Larkspur Water Budget
Monthly Watering Guide for Larkspur
Larkspur 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 | Larkspur Needs | Rainfall | You Supplement | Action |
|---|---|---|---|---|
| Jan | — | 0.6" | 0" | ❄️ Dormant |
| Feb | — | 0.8" | 0" | ❄️ Dormant |
| Mar | — | 1.8" | 0" | ❄️ Dormant |
| Apr | 2.2" | 2.7" | 0" | ✅ Rainfall sufficient |
| May | 2.2" | 4.2" | 0" | ✅ Rainfall sufficient |
| Jun | 2.2" | 3.8" | 0" | ✅ Rainfall sufficient |
| Jul | 2.2" | 3.2" | 0" | ✅ Rainfall sufficient |
| Aug | 2.2" | 3.3" | 0" | ✅ Rainfall sufficient |
| Sep | 2.2" | 2.4" | 0" | ✅ Rainfall sufficient |
| Oct | 2.2" | 1.8" | 0.4" | 💧 Light watering |
| Nov | — | 0.8" | 0" | ❄️ Dormant |
| Dec | — | 0.6" | 0" | ❄️ Dormant |
Water needs are for active growing months only (Apr–Oct in Bourbon County). Supplement amounts are based on average rainfall — actual needs vary with temperature, soil, and mulching.
Larkspur 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.
Larkspur Planting Timeline — Bourbon County, KS
Larkspur Planting Calendar
| Activity | When | Date Range |
|---|---|---|
| Direct Sow | March 11 | Mar 11 – Apr 1 |
| Bloom | May 20 | May 20 – Jul 29 |
| Fall Sowing | August 16 | Aug 16 – Aug 30 |
Plant 0.1" deep · 8" apart · Rows 12" apart
Month-by-Month Timeline
| Month | Activities |
|---|---|
| January | — |
| February | — |
| March | Direct Sow |
| April | Direct Sow |
| May | Bloom |
| June | Bloom |
| July | Bloom |
| August | Fall Sowing |
| September | — |
| October | — |
| November | — |
| December | — |
Growing Conditions
☀️ Sun
Full Sun (6-8+ hours)
💧 Water
0.5"/week · Natural rainfall sufficient
📅 Days to Maturity
60–90 days
🧪 Soil pH
Needs 6–7 · Your soil: acceptable
🗺️ USDA Zone
Zone 7a
📆 Growing Season
200 days in Bourbon County
Growing Tips for Larkspur in Bourbon County
Direct sow Larkspur outdoors after April 08 in Bourbon County when soil has warmed and frost danger has passed.
General growing tips
Larkspur does not transplant well — direct-sow only. In cold climates (zones 2–6), sow directly in early spring as soon as soil can be worked, 4–6 weeks before last frost; cold soil improves germination. In zones 7–10, fall-sow 8–10 weeks before first frost for spring bloom. Press seeds lightly into soil; they need darkness to germinate — cover with 1/8–1/4 inch of soil. Thin to 6–12 inches to prevent powdery mildew. Allow seed pods to mature and self-sow for naturalized colonies. All parts are toxic if ingested.
Companion Planting
Good Companions
Check more plant combinations with our Companion Planting Checker →
Larkspur in Other Locations
Frequently Asked Questions
When should I plant Larkspur in Bourbon County, KS?
Bourbon County is in Zone 7a with an average last frost of April 8. Plan your Larkspur planting based on this frost date — see the calendar above for exact timing.
What planting zone is Bourbon County, KS?
Bourbon County, Kansas is in USDA Hardiness Zone 7a. The average last spring frost is April 8 and first fall frost is October 25.
When should I plant Larkspur in Bourbon County County, ?
In Bourbon County County, , plant Larkspur after the last frost (around April 8) and before the first frost (around October 25). Best results when soil holds above 50°F.
What growing zone is Bourbon County County, for Larkspur?
Bourbon County County sits in USDA Zone 7a. Larkspur grows reliably in zones 2a through 10b, so it's a good fit here.
Can Larkspur grow in Bourbon County County's climate?
Yes — Larkspur grows well in Bourbon County County's temperate climate. Bourbon County County averages a 200-day frost-free season, with last frost around April 8 and first frost around October 25.
Your Bourbon County Garden Planner — Free
A 22-page printable planner built for Bourbon 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.