When to plant Comfrey in Penobscot County, ME
Plant Comfrey in Penobscot County, between May 17 and May 31 — the only viable window. Zone 5a's short season (145 frost-free days) rules out a fall crop.
When to Plant Comfrey in Penobscot County, ME
Comfrey is a vigorous perennial herb valued as a dynamic accumulator of nutrients. Its leaves make excellent mulch, compost activator, and liquid fertilizer.
Penobscot County, Maine is in USDA Zone 5a. The average last spring frost is May 10 and the first fall frost is October 2, giving you a growing season of approximately 145 days.
At an elevation of 842 feet, Penobscot County receives approximately 38.8 inches of rainfall annually with predominantly silt loam soil. Summer highs average 83°F, so choose short-season varieties of Comfrey to ensure they mature before fall.
Penobscot County Soil Profile
Soil Type
Silt Loam
Soil pH
6.0-7.0
Drainage
Well Drained
Comfrey Planting Timeline — Penobscot County, ME
Comfrey Planting Calendar
| Activity | When | Date Range |
|---|---|---|
| Transplant Outdoors | May 17 | May 17 – May 31 |
| Harvest | July 19 | Jul 19 – Sep 27 |
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 5a
📆 Growing Season
145 days in Penobscot County
Growing Tips for Penobscot 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 Penobscot County, ME?
Penobscot County is in Zone 5a with an average last frost of May 10. Plan your Comfrey planting based on this frost date — see the calendar above for exact timing.
What planting zone is Penobscot County, ME?
Penobscot County, Maine is in USDA Hardiness Zone 5a. The average last spring frost is May 10 and first fall frost is October 2.
When should I plant Comfrey in Penobscot County, ME?
In Penobscot County, ME, plant Comfrey after the last frost (around May 10) and before the first frost (around October 2). Best results when soil holds above 50°F.
What growing zone is Penobscot County, ME for Comfrey?
Penobscot County sits in USDA Zone 5a. Comfrey grows reliably in zones 3a through 9b, so it's a good fit here.
Can Comfrey grow in Penobscot County's climate?
Yes — Comfrey grows well in Penobscot County's temperate climate. Penobscot County averages a 145-day frost-free season, with last frost around May 10 and first frost around October 2.
Your Penobscot County Garden Planner — Free
A 22-page printable planner built for Penobscot County (Zone 5a). Planting dates, a month-by-month schedule, harvest log, seed inventory, and succession charts — all dialed in for your exact growing season.