When to plant Echinacea (Purple Coneflower) in Linn County County,
The best window to plant Echinacea (Purple Coneflower) in Linn County County, is May 1–May 22, when soil warms to 50°F. Last frost typically hits April 17; first frost October 20.
When to Plant Echinacea (Purple Coneflower) in Linn County, MO
June in the garden — Linn County, Missouri
A quick June briefing for Linn County, Missouri gardeners — what's urgent, what's next, and what can wait.
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Sow echinacea (purple coneflower) in trays indoors
Give them 6–8 weeks indoors before the last frost and you'll transplant into warm soil with seedlings that are already leaping.
A few tasks this June that'll pay off in July
- First harvests: echinacea (purple coneflower)
Echinacea purpurea (Purple Coneflower) is a long-lived native prairie perennial and one of the most valuable pollinator plants in North American gardens. Its distinctive daisy-like blooms — swept-back lavender-pink petals surrounding a spiny orange-brown cone — attract bees, butterflies, and goldfinches from summer into fall. Drought-tolerant once established, adaptable to average soils, and impressively long-lived; mature clumps bloom reliably for decades.
Linn County, Missouri is in USDA Zone 6a. The average last spring frost is April 17 and the first fall frost is October 20, giving you a growing season of approximately 186 days.
At an elevation of 880 feet, Linn County receives approximately 32.4 inches of rainfall annually with predominantly silt loam soil. Summer highs average 85°F, providing good warmth for Echinacea (Purple Coneflower) during the growing season.
Linn County Soil Profile
Soil Type
Silt Loam
Soil pH
5.5-6.8
Drainage
Well Drained
Echinacea (Purple Coneflower) 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 Linn County
How your county's soil matches Echinacea (Purple Coneflower)'s growing requirements.
Soil pH
Your soil pH (5.5–6.8) overlaps with Echinacea (Purple Coneflower)'s range (6.0–7.0), though not a perfect match.
Soil Texture
The silt loam soil in Linn County is excellent for Echinacea (Purple Coneflower) — good drainage, moisture retention, and nutrient holding capacity.
Organic Matter
Organic matter is moderate (2.8%). Annual compost additions will help Echinacea (Purple Coneflower).
How to Plant Echinacea (Purple Coneflower)
Succession Planting Echinacea (Purple Coneflower)
Sow every 8 weeks. Last sowing by Jul 22 to harvest before frost.
Echinacea (Purple Coneflower) Water Budget
Water stress score is 6/10 — consider drought-tolerant varieties and mulching
Monthly Watering Guide for Echinacea (Purple Coneflower)
Echinacea (Purple Coneflower) 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 | Echinacea (Purple Coneflower) Needs | Rainfall | You Supplement | Action |
|---|---|---|---|---|
| Jan | — | 1.4" | 0" | ❄️ Dormant |
| Feb | — | 1.7" | 0" | ❄️ Dormant |
| Mar | — | 2.4" | 0" | ❄️ Dormant |
| Apr | 2.2" | 2.8" | 0" | ✅ Rainfall sufficient |
| May | 2.2" | 3.5" | 0" | ✅ Rainfall sufficient |
| Jun | 2.2" | 3.7" | 0" | ✅ Rainfall sufficient |
| Jul | 2.2" | 3.5" | 0" | ✅ Rainfall sufficient |
| Aug | 2.2" | 3.8" | 0" | ✅ Rainfall sufficient |
| Sep | 2.2" | 2.9" | 0" | ✅ Rainfall sufficient |
| Oct | 2.2" | 2.4" | 0" | ✅ Rainfall sufficient |
| Nov | — | 2.7" | 0" | ❄️ Dormant |
| Dec | — | 1.8" | 0" | ❄️ Dormant |
Water needs are for active growing months only (Apr–Oct in Linn County). Supplement amounts are based on average rainfall — actual needs vary with temperature, soil, and mulching.
Echinacea (Purple Coneflower) 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.
Echinacea (Purple Coneflower) Planting Timeline — Linn County, MO
Echinacea (Purple Coneflower) Planting Calendar
| Activity | When | Date Range |
|---|---|---|
| Start Indoors | February 13 | Feb 13 – Feb 27 |
| Transplant Outdoors | May 1 | May 1 – May 15 |
| Direct Sow | May 1 | May 1 – May 22 |
| Bloom | July 24 | Jul 24 – Oct 30 |
Plant 0.3" deep · 18" apart · Rows 24" apart
Month-by-Month Timeline
| Month | Activities |
|---|---|
| January | — |
| February | Start Indoors |
| March | — |
| April | — |
| May | Transplant Outdoors Direct Sow |
| June | — |
| July | Bloom |
| August | Bloom |
| September | Bloom |
| October | Bloom |
| November | — |
| December | — |
Growing Conditions
☀️ Sun
Full Sun (6-8+ hours)
💧 Water
0.5"/week · Natural rainfall sufficient
📅 Days to Maturity
70–90 days
🧪 Soil pH
Needs 6–7 · Your soil: acceptable
🗺️ USDA Zone
Zone 6a
📆 Growing Season
186 days in Linn County
Growing Tips for Echinacea (Purple Coneflower) in Linn County
Direct sow Echinacea (Purple Coneflower) outdoors after April 17 in Linn County when soil has warmed and frost danger has passed.
Common pests for Echinacea (Purple Coneflower) in this region include aphids and slugs. Use row covers early in the season and inspect plants weekly.
General growing tips
Start seeds indoors 8–10 weeks before last frost or direct-sow in fall for natural cold stratification. Seeds require 4–8 weeks of cold moist stratification (or fall sowing) for best germination. Transplant when night temps stay above 50°F. Full sun is essential for heavy bloom. Avoid over-fertilizing — lean soil produces more compact, floriferous plants. Deadhead for continuous bloom but leave some cones standing in fall for goldfinch seed harvest. Year 2+ plants bloom most heavily; first-year transplants may produce limited flowers. Divide congested clumps every 3–4 years in early spring.
Companion Planting
Good Companions
Check more plant combinations with our Companion Planting Checker →
Echinacea (Purple Coneflower) in Other Locations
Frequently Asked Questions
When should I plant Echinacea (Purple Coneflower) in Linn County, MO?
Linn County is in Zone 6a with an average last frost of April 17. Plan your Echinacea (Purple Coneflower) planting based on this frost date — see the calendar above for exact timing.
What planting zone is Linn County, MO?
Linn County, Missouri is in USDA Hardiness Zone 6a. The average last spring frost is April 17 and first fall frost is October 20.
When should I plant Echinacea (Purple Coneflower) in Linn County, ?
In Linn County, , plant Echinacea (Purple Coneflower) after the last frost (around April 17) and before the first frost (around October 20). Best results when soil holds above 50°F.
What growing zone is Linn County, for Echinacea (Purple Coneflower)?
Linn County sits in USDA Zone 6a. Echinacea (Purple Coneflower) grows reliably in zones 3a through 9b, so it's a good fit here.
Can Echinacea (Purple Coneflower) grow in Linn County's climate?
Yes — Echinacea (Purple Coneflower) grows well in Linn County's temperate climate. Linn County averages a 186-day frost-free season, with last frost around April 17 and first frost around October 20.
Your Linn County Garden Planner — Free
A 22-page printable planner built for Linn 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.