When to Plant Comfrey in North Dakota
North Dakota spans USDA hardiness 3b to 4b (zones 3b to 4b on this page). Plant comfrey by your local frost date, not the calendar — pick your zone below for exact start-indoors, transplant, and harvest dates.
Jump to: Zone 3b · Zone 4a · Zone 4b
Comfrey planting calendar for North Dakota, Zone 3b
Average last spring frost
May 20
Average first fall frost
September 15
Direct sow
May 20
Projected first harvest
Jul 19
Comfrey is ready to harvest in about 60 days. Full zone 3 guide (both 3a and 3b) →
Comfrey planting calendar for North Dakota, Zone 4a
Average last spring frost
May 15
Average first fall frost
September 20
Direct sow
May 15
Projected first harvest
Jul 14
Comfrey is ready to harvest in about 60 days. Full zone 4 guide (both 4a and 4b) →
Comfrey planting calendar for North Dakota, Zone 4b
Average last spring frost
May 10
Average first fall frost
September 25
Direct sow
May 10
Projected first harvest
Jul 9
Comfrey is ready to harvest in about 60 days. Full zone 4 guide (both 4a and 4b) →
Not sure which half-zone you're in? Set your ZIP in HomeSown for dates tuned to your exact location.
Varieties to grow
1 variety of comfrey in the HomeSown library. Tap any for its full grow guide.
Common problems with comfrey
What to watch for, with identification and treatment for each
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