St John's wort (Hypericum patulum)
Care, watering, light and tips for St John's wort on Floravia.
Quick facts
- Family: Hypericaceae
- Difficulty: Moderate care
- Watering: every 7 days
- Light: Partial shade
- Temperature: 10–30 °C
- Toxicity: Toxic to pets
About St John's wort
Hypericum patulum, known as Jin Si Mei or Shrubby St. John's Wort, is a medium-sized deciduous or semi-evergreen shrub, valued for its attractive bright yellow flowers that bloom from late spring to autumn. Its delicate flowers, often with prominent stamens, beautifully contrast with its dark green foliage. It is ideal for borders, beds, or as ground cover in temperate gardens, adding a touch of color and vibrancy.
Native range
East Asia (China and Japan)
Care tips
It prefers full sun to partial shade and well-drained, slightly acidic to neutral soil. Watering should be regular during dry periods, especially in summer, keeping the substrate moist but not waterlogged. Light pruning after flowering helps maintain its shape and promotes more abundant blooms. Avoid heavy, clay soils which can lead to root rot.
How to save a dying St John's wort
- Warning signs
- Yellow or brown, wilted leaves, dropping flowers and shoots. Soft or dry stems.
- First aid
- Check drainage. If waterlogged, remove plant, discard wet soil, trim rotten roots, repot with fresh substrate. If dry, water thoroughly.
- What kills it
- Overwatering causing root rot, or underwatering leading to rapid dehydration. Also lack of light.
- Can it be saved?
- Yes, if you act quickly. Observe roots and overall condition for accurate diagnosis. Prune damaged parts.