When to plant Comfrey in Big Stone County County,
In Big Stone County County, Comfrey is a single-season spring crop — there's no second fall window. Plant May 9–May 23 for an 90-day harvest, finishing well before the October 4 first frost.
When to Plant Comfrey in Big Stone County, MN
Comfrey is a vigorous perennial herb valued as a dynamic accumulator of nutrients. Its leaves make excellent mulch, compost activator, and liquid fertilizer.
Big Stone County, Minnesota is in USDA Zone 4b. The average last spring frost is May 2 and the first fall frost is October 4, giving you a growing season of approximately 155 days.
At an elevation of 823 feet, Big Stone County receives approximately 32.5 inches of rainfall annually with predominantly silt loam soil. Summer highs average 81°F, so choose short-season varieties of Comfrey to ensure they mature before fall.
Big Stone County Soil Profile
Soil Type
Silt Loam
Soil pH
6.0-7.0
Drainage
Well Drained
Comfrey Planting Timeline — Big Stone County, MN
Comfrey Planting Calendar
| Activity | When | Date Range |
|---|---|---|
| Transplant Outdoors | May 9 | May 9 – May 23 |
| Harvest | July 11 | Jul 11 – Sep 19 |
Plant 0.5" deep · 8" apart · Rows 12" apart
Month-by-Month Timeline
| Month | Activities |
|---|---|
| January | — |
| February | — |
| March | — |
| April | — |
| May | Transplant Outdoors |
| June | — |
| July | Harvest |
| August | Harvest |
| September | Harvest |
| October | — |
| November | — |
| December | — |
Growing Conditions
☀️ Sun
Partial Shade (3-6 hours)
💧 Water
Moderate — regular watering
📅 Days to Maturity
60–90 days
🧪 Soil pH
Needs 6–7 · Your soil: N/A
🗺️ USDA Zone
Zone 4b
📆 Growing Season
155 days in Big Stone County
Growing Tips for Big Stone County
Plant root cuttings 2 inches deep. Choose Bocking 14 variety to prevent self-seeding. Cut leaves 3-4 times per season for mulch or compost. Avoid planting near pathways as it spreads.
Companion Planting
Good Companions
Check more plant combinations with our Companion Planting Checker →
Comfrey in Other Locations
Frequently Asked Questions
When should I plant Comfrey in Big Stone County, MN?
Big Stone County is in Zone 4b with an average last frost of May 2. Plan your Comfrey planting based on this frost date — see the calendar above for exact timing.
What planting zone is Big Stone County, MN?
Big Stone County, Minnesota is in USDA Hardiness Zone 4b. The average last spring frost is May 2 and first fall frost is October 4.
When should I plant Comfrey in Big Stone County County, ?
In Big Stone County County, , plant Comfrey after the last frost (around May 2) and before the first frost (around October 4). Best results when soil holds above 50°F.
What growing zone is Big Stone County County, for Comfrey?
Big Stone County County sits in USDA Zone 4b. Comfrey grows reliably in zones 3a through 9b, so it's a good fit here.
Can Comfrey grow in Big Stone County County's climate?
Yes — Comfrey grows well in Big Stone County County's temperate climate. Big Stone County County averages a 155-day frost-free season, with last frost around May 2 and first frost around October 4.
Your Big Stone County Garden Planner — Free
A 22-page printable planner built for Big Stone County (Zone 4b). Planting dates, a month-by-month schedule, harvest log, seed inventory, and succession charts — all dialed in for your exact growing season.