When to plant Comfrey in Renville County, MN
Renville County's 159-day season only supports one Comfrey planting per year. Sow between May 7 and May 21 for the best chance at full maturity before October 6.
When to Plant Comfrey in Renville 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.
Renville County, Minnesota is in USDA Zone 4b. The average last spring frost is April 30 and the first fall frost is October 6, giving you a growing season of approximately 159 days.
At an elevation of 758 feet, Renville County receives approximately 34.1 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.
Renville County Soil Profile
Soil Type
Silt Loam
Soil pH
6.0-7.0
Drainage
Well Drained
Comfrey Planting Timeline — Renville County, MN
Comfrey Planting Calendar
| Activity | When | Date Range |
|---|---|---|
| Transplant Outdoors | May 7 | May 7 – May 21 |
| Harvest | July 9 | Jul 9 – Sep 17 |
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
159 days in Renville County
Growing Tips for Renville 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 Renville County, MN?
Renville County is in Zone 4b with an average last frost of April 30. Plan your Comfrey planting based on this frost date — see the calendar above for exact timing.
What planting zone is Renville County, MN?
Renville County, Minnesota is in USDA Hardiness Zone 4b. The average last spring frost is April 30 and first fall frost is October 6.
When should I plant Comfrey in Renville County, MN?
In Renville County, MN, plant Comfrey after the last frost (around April 30) and before the first frost (around October 6). Best results when soil holds above 50°F.
What growing zone is Renville County, MN for Comfrey?
Renville 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 Renville County's climate?
Yes — Comfrey grows well in Renville County's temperate climate. Renville County averages a 159-day frost-free season, with last frost around April 30 and first frost around October 6.
Your Renville County Garden Planner — Free
A 22-page printable planner built for Renville 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.