When to plant Comfrey in Beltrami County, MN
Beltrami County's 135-day season only supports one Comfrey planting per year. Sow between May 23 and June 6 for the best chance at full maturity before September 28.
When to Plant Comfrey in Beltrami County, MN
Your June game plan for Beltrami County, Minnesota
If you only do a handful of things in the garden this June, make it these. They're sequenced around your zone's frost timing.
Looking ahead to July
- First harvests: comfrey
Comfrey is a vigorous perennial herb valued as a dynamic accumulator of nutrients. Its leaves make excellent mulch, compost activator, and liquid fertilizer.
Beltrami County, Minnesota is in USDA Zone 3b. The average last spring frost is May 16 and the first fall frost is September 28, giving you a growing season of approximately 135 days.
At an elevation of 1,023 feet, Beltrami County receives approximately 39.1 inches of rainfall annually with predominantly silt loam soil. Summer highs average 79°F, so choose short-season varieties of Comfrey to ensure they mature before fall.
Beltrami County Soil Profile
Soil Type
Silt Loam
Soil pH
5.9-7
Drainage
Well Drained
Comfrey 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 Beltrami County
How your county's soil matches Comfrey's growing requirements.
Soil pH
Your soil pH (5.9–7.0) overlaps with Comfrey's range (6.0–7.0), though not a perfect match.
Soil Texture
The silt loam soil in Beltrami County is excellent for Comfrey — good drainage, moisture retention, and nutrient holding capacity.
Organic Matter
Organic matter is excellent (4.4%) — Comfrey will thrive.
How to Plant Comfrey
Succession Planting Comfrey
Sow every 6.9 weeks. Last sowing by Jun 30 to harvest before frost.
Comfrey Water Budget
Monthly Watering Guide for Comfrey
Comfrey needs approximately 1 inches of water per week (4.3" per month). Here's how your county's rainfall compares month by month.
| Month | Comfrey Needs | Rainfall | You Supplement | Action |
|---|---|---|---|---|
| Jan | — | 1.5" | 0" | ❄️ Dormant |
| Feb | — | 1.8" | 0" | ❄️ Dormant |
| Mar | — | 2.7" | 0" | ❄️ Dormant |
| Apr | — | 3.6" | 0" | ❄️ Dormant |
| May | 4.3" | 4.6" | 0" | ✅ Rainfall sufficient |
| Jun | 4.3" | 5.2" | 0" | ✅ Rainfall sufficient |
| Jul | 4.3" | 4.6" | 0" | ✅ Rainfall sufficient |
| Aug | 4.3" | 4.2" | 0.1" | 💧 Light watering |
| Sep | 4.3" | 3.4" | 0.9" | 💧 Light watering |
| Oct | — | 3.2" | 0" | ❄️ Dormant |
| Nov | — | 2.4" | 0" | ❄️ Dormant |
| Dec | — | 1.9" | 0" | ❄️ Dormant |
Water needs are for active growing months only (May–Sep in Beltrami County). Supplement amounts are based on average rainfall — actual needs vary with temperature, soil, and mulching.
Comfrey 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.
Comfrey Planting Timeline — Beltrami County, MN
Comfrey Planting Calendar
| Activity | When | Date Range |
|---|---|---|
| Transplant Outdoors | May 23 | May 23 – Jun 6 |
| Harvest | July 25 | Jul 25 – Sep 26 |
Plant 0.5" deep · 8" apart · Rows 12" apart
Month-by-Month Timeline
| Month | Activities |
|---|---|
| January | — |
| February | — |
| March | — |
| April | — |
| May | Transplant Outdoors |
| June | Transplant Outdoors |
| July | Harvest |
| August | Harvest |
| September | Harvest |
| October | — |
| November | — |
| December | — |
Growing Conditions
☀️ Sun
Partial Shade (3-6 hours)
💧 Water
1"/week · Natural rainfall sufficient
📅 Days to Maturity
60–90 days
🧪 Soil pH
Needs 6–7 · Your soil: acceptable
🗺️ USDA Zone
Zone 3b
📆 Growing Season
135 days in Beltrami County
Growing Tips for Comfrey in Beltrami County
Direct sow Comfrey outdoors after May 16 in Beltrami County when soil has warmed and frost danger has passed.
General growing tips
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 Beltrami County, MN?
Beltrami County is in Zone 3b with an average last frost of May 16. Plan your Comfrey planting based on this frost date — see the calendar above for exact timing.
What planting zone is Beltrami County, MN?
Beltrami County, Minnesota is in USDA Hardiness Zone 3b. The average last spring frost is May 16 and first fall frost is September 28.
When should I plant Comfrey in Beltrami County, MN?
In Beltrami County, MN, plant Comfrey after the last frost (around May 16) and before the first frost (around September 28). Best results when soil holds above 50°F.
What growing zone is Beltrami County, MN for Comfrey?
Beltrami County sits in USDA Zone 3b. Comfrey grows reliably in zones 3a through 9b, so it's a good fit here.
Can Comfrey grow in Beltrami County's climate?
Yes — Comfrey grows well in Beltrami County's temperate climate. Beltrami County averages a 135-day frost-free season, with last frost around May 16 and first frost around September 28.
Your Beltrami County Garden Planner — Free
A 22-page printable planner built for Beltrami County (Zone 3b). Planting dates, a month-by-month schedule, harvest log, seed inventory, and succession charts — all dialed in for your exact growing season.