🌼 St. John's Wort: Growing Guide
St. John's Wort (Hypericum perforatum) grows best in full sun with little water, and does well at −25 to 35 °C (−13 to 95 °F) in soil with a pH of 5.5–7.0. Space plants about 40 cm (16 in) apart. Expect 365+ days (a perennial — it takes more than a season).
Quick facts
| Scientific name | Hypericum perforatum |
|---|---|
| Category | Greek Herbs |
| Sunlight | Full sun |
| Watering | Low |
| Plant spacing | 40 cm (16 in) |
| Soil pH | 5.5–7.0 |
| Comfortable temperature | −25 to 35 °C (−13 to 95 °F) |
| Time to maturity | 365+ days (a perennial — it takes more than a season) |
| Sowing depth | 0.3 cm (0.1 in) |
| Height | 30–80 cm (12–31 in) |
When to sow, plant and harvest
The calendar below shows the best months in each climate zone. Pick the zone closest to your garden.
| J | F | M | A | M | J | J | A | S | O | N | D | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Mediterranean | Plant out | Plant out | Harvest | Harvest | Harvest | |||||||
| Continental | Plant out | Harvest | Harvest | Harvest | ||||||||
| Oceanic | Plant out | Plant out | Harvest | Harvest | Harvest | |||||||
| Subtropical | Plant out | Harvest | Harvest | Harvest | Plant out | Harvest | Harvest | |||||
| Cold / Northern | Plant out | Harvest | Harvest | |||||||||
| Arid / Semi-arid | Plant out | Harvest | Harvest | Plant out | Harvest |
- Mediterranean (Greece, Spain, Italy, coastal Turkey): Plant out: Mar–Apr · Harvest: May–Jul.
- Continental (Central/Northern Europe, inland Balkans): Plant out: Apr · Harvest: May–Jul.
- Oceanic (UK, France, Belgium, Netherlands, NW Europe): Plant out: Mar–Apr · Harvest: May–Jul.
- Subtropical (Southern US, N. Africa, Middle East): Plant out: Feb, Aug · Harvest: Mar–May, Sep–Oct.
- Cold / Northern (Scandinavia, Canada, Russia, Alpine): Plant out: May · Harvest: Jun–Jul.
- Arid / Semi-arid (Arabian Peninsula, inland Australia): Plant out: Feb, Aug · Harvest: Mar–Apr, Sep.
Watering
Water about every 5 days in summer and about every 14 days in winter. Moderate watering.
Growing tips
Traditionally used in herbal teas. Contains hypericin. Small yellow star-shaped flowers. Grows wild in mountain areas.
Good companion plants
These plants grow well alongside it:
Frequently asked questions
St. John's Wort: when should I sow and plant it?
Mediterranean (Greece, Spain, Italy, coastal Turkey): Plant out: Mar–Apr · Harvest: May–Jul. Continental (Central/Northern Europe, inland Balkans): Plant out: Apr · Harvest: May–Jul. Oceanic (UK, France, Belgium, Netherlands, NW Europe): Plant out: Mar–Apr · Harvest: May–Jul.
St. John's Wort: how often should I water it?
Water about every 5 days in summer and about every 14 days in winter. Moderate watering.
St. John's Wort: how far apart should I plant it?
Plant about 40 cm (16 in) apart and sow at a depth of about 0.3 cm (0.1 in).
St. John's Wort: how long does it take to grow?
Plan on 365+ days (a perennial — it takes more than a season).
St. John's Wort: which plants grow well with it?
Yarrow.
Plan your garden
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