St John's wort (Hypericum perforatum)
Care, watering, light and tips for St John's wort on Floravia.
Quick facts
- Family: Hypericaceae
- Difficulty: Easy to care for
- Watering: every 7 days
- Light: Partial shade
- Temperature: 10–30 °C
- Toxicity: Toxic to pets
About St John's wort
Hypericum perforatum, commonly known as St. John's Wort, is a perennial herbaceous plant from the Hypericaceae family, valued for both its small, bright yellow flowers and its medicinal properties. Its reddish stems and oval leaves, which appear perforated when held up to the light (hence its name 'perforatum'), make it attractive in naturalistic gardens or as part of a low hedge. It is ideal for sunny borders or for adding a rustic, wild touch.
Native range
Europe, Asia and North Africa
Care tips
St. John's Wort thrives in full sun to partial shade, requiring at least 6 hours of direct sunlight for optimal flowering. It prefers well-drained soils, although it is quite tolerant of different soil types, as long as they are not waterlogged; a sandy or loamy substrate is ideal. Watering should be moderate, allowing the substrate to dry out slightly between waterings once established, as it is sensitive to excessive moisture. A common mistake is overwatering, which can lead to root rot, especially in heavy soils.
How to save a dying St John's wort
- Warning signs
- Yellowish or reddish leaves, weak and drooping stems, no flowering or withered flowers.
- First aid
- Move to partial shade, water moderately if substrate is dry, check drainage.
- What kills it
- Excessive direct sun and intense heat, waterlogged substrate.
- Can it be saved?
- Yes, if you act quickly to correct environment and watering.