When to Plant St. John's Wort in Zone 3
In USDA zone 3a, start seeds indoors around April 4, transplant or plant outdoors June 13 to October 11, and expect your first harvest around October 11. (3a shown here — see 3a and 3b dates separately below.)
St. John's Wort planting calendar for USDA Zone 3a
Average last spring frost
May 30
Average first fall frost
September 10
Start seeds indoors
Apr 4
Transplant outdoors
Jun 13
Projected first harvest
Oct 11
St. John's Wort is ready to harvest in about 120 days, needing roughly 103 frost-free days in zone 3a.
St. John's Wort planting calendar for USDA Zone 3b
Average last spring frost
May 20
Average first fall frost
September 15
Start seeds indoors
Mar 25
Transplant outdoors
Jun 3
Projected first harvest
Oct 1
St. John's Wort is ready to harvest in about 120 days, needing roughly 118 frost-free days in zone 3b.
Not sure whether you're in 3a or 3b? Set your ZIP in HomeSown for dates tuned to your exact location.
Varieties to grow
1 variety of st. john's wort in the HomeSown library. Tap any for its full grow guide.
Common problems with st. john's wort
What to watch for, with identification and treatment for each
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