When to Plant St. John's Wort in Zone 5
In USDA zone 5a, start seeds indoors around March 10, transplant or plant outdoors May 19 to September 16, and expect your first harvest around September 16. (5a shown here — see 5a and 5b dates separately below.)
St. John's Wort planting calendar for USDA Zone 5a
Average last spring frost
May 5
Average first fall frost
October 1
Start seeds indoors
Mar 10
Transplant outdoors
May 19
Projected first harvest
Sep 16
St. John's Wort is ready to harvest in about 120 days, needing roughly 149 frost-free days in zone 5a.
St. John's Wort planting calendar for USDA Zone 5b
Average last spring frost
April 30
Average first fall frost
October 5
Start seeds indoors
Mar 5
Transplant outdoors
May 14
Projected first harvest
Sep 11
St. John's Wort is ready to harvest in about 120 days, needing roughly 158 frost-free days in zone 5b.
Not sure whether you're in 5a or 5b? 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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