When to Plant St. John's Wort in Zone 4
In USDA zone 4, start seeds indoors around March 20, transplant or plant outdoors May 29 to September 26, and expect your first harvest around September 26.
St. John's Wort planting calendar for USDA Zone 4
Start seeds indoors
Mar 20
Transplant outdoors
May 29
Projected first harvest
Sep 26
St. John's Wort is ready to harvest in about 120 days. Dates use USDA zone 4a average frost dates. Set your ZIP in HomeSown for dates tuned to your exact location.
What zone 4 means for st. john's wort
Average last spring frost
May 15
Average first fall frost
September 20
Those two dates are what set the schedule above. Zone 4 gives you roughly 128 frost-free days, and st. john's wort need about 120 days to mature.
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
🌱 Grow st. john's wort with a calendar built for your exact yard
HomeSown turns your ZIP code into a personalized planting calendar, watering reminders, and pest help. Free to start.
Start your free garden →