When to plant Comfrey in Gem County, ID
In Gem County, Comfrey is a single-season spring crop — there's no second fall window. Plant May 16–May 30 for an 60–90-day harvest, finishing well before the October 1 first frost.
When to Plant Comfrey in Gem County, ID
Comfrey is a vigorous perennial herb valued as a dynamic accumulator of nutrients. Its leaves make excellent mulch, compost activator, and liquid fertilizer.
Gem County, Idaho is in USDA Zone 7a. The average last spring frost is May 9 and the first fall frost is October 1, giving you a growing season of approximately 145 days.
At an elevation of 6,100 feet, Gem County receives approximately 16 inches of rainfall annually with predominantly loam soil. Summer highs average 87°F, providing good warmth for Comfrey during the growing season. With low rainfall, drip irrigation is essential for growing Comfrey successfully. Mulch heavily to conserve soil moisture.
Gem County Soil Profile
Soil Type
Loam
Soil pH
6.0-7.0
Drainage
Well Drained
Comfrey Planting Timeline — Gem County, ID
Comfrey Planting Calendar
| Activity | When | Date Range |
|---|---|---|
| Transplant Outdoors | May 16 | May 16 – May 30 |
| Harvest | July 18 | Jul 18 – 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 | — |
| 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 7a
📆 Growing Season
145 days in Gem County
Growing Tips for Gem 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 Gem County, ID?
Gem County is in Zone 7a with an average last frost of May 9. Plan your Comfrey planting based on this frost date — see the calendar above for exact timing.
What planting zone is Gem County, ID?
Gem County, Idaho is in USDA Hardiness Zone 7a. The average last spring frost is May 9 and first fall frost is October 1.
When should I plant Comfrey in Gem County, ID?
In Gem County, ID, plant Comfrey after the last frost (around May 9) and before the first frost (around October 1). Best results when soil holds above 50°F.
What growing zone is Gem County, ID for Comfrey?
Gem County sits in USDA Zone 7a. Comfrey grows reliably in zones 3a through 9b, so it's a good fit here.
Can Comfrey grow in Gem County's climate?
Yes — Comfrey grows well in Gem County's temperate climate. Gem County averages a 145-day frost-free season, with last frost around May 9 and first frost around October 1.
Your Gem County Garden Planner — Free
A 22-page printable planner built for Gem County (Zone 7a). Planting dates, a month-by-month schedule, harvest log, seed inventory, and succession charts — all dialed in for your exact growing season.