How long does st. john's wort take to grow?

St. John's Wort is ready to harvest in about 120 days, measured from planting.

When to Plant St. John's Wort in Hawaii

Hawaii doesn't get a seasonal frost, so st. john's wort plants on a warm/cool-season calendar rather than frost dates. See the full calendar below.

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Best planting window

Year-round

🌴 Your zone never frosts, so planting is timed to the cooler vs. warmer seasons rather than a frost date.

JJan

FFeb

MMar

AApr

MMay

JJun

JJul

AAug

SSep

OOct

NNov

DDec

🌿 Planting windowTodayHonolulu, HI: frost-free; timed to seasons, not frost

St. John's Wort is ready to harvest in about 120 days. Set your ZIP in HomeSown for dates tuned to your exact location.

1 variety of st. john's wort in the HomeSown library. Tap any for its full grow guide.

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.