PlantFun
Plant Needs
Sunlight
Thrives in full sun for maximum flowering; tolerates partial shade but may produce fewer blooms.
Watering
Water deeply when the top 2–3 cm of soil is dry; avoid overwatering to prevent root rot.
Temperature
Hardy to freezing temperatures; tolerates cool summer heat, avoid prolonged exposure to temperatures above 30°C.
Characteristics
- Leaf: Narrow linear to lanceolate leaves, 1–3 cm long, opposite arrangement, with translucent glandular dots.
- Flower: Bright yellow 1–2 cm diameter blooms, five petals with black marginal glands, clustered at stem tips.
- Stem: Slender erect to spreading stems, green to reddish-brown, with two raised longitudinal ridges.
Care Guide
Watering
Keep soil consistently moist but not waterlogged; increase frequency during hot, dry spells
Fertilization
Apply a balanced slow-release fertilizer once at the start of growth. Avoid over-fertilizing to prevent leggy, weak growth.
Eggshell powder top-dressing：Crush dried eggshells into fine powder and sprinkle lightly around the plant base to boost soil calcium and improve drainage; avoid placing large chunks near stems.Pruning
- Deadhead spent blooms promptly to encourage extended flowering throughout the summer.
- Trim back leggy stems in early spring to maintain a compact, bushy habit.
- Remove damaged or diseased foliage immediately to prevent the spread of pathogens.
- Cut back the plant to 5–10 cm above ground in late winter to promote vigorous new spring growth.
Toxicity
Warning: this plant may be toxic.
Pets & Humans
Pets: ASPCA: Toxic; contains hypericin which causes photosensitivity, vomiting, diarrhea, and lethargy in cats.
Humans: Ingestion may cause mild gastrointestinal upset and skin photosensitivity if exposed to sunlight after contact or consumption.
Garden Uses & Culture
Culture: Associated with traditional European herbal medicine for mood support and wound care; symbolizes protection and healing.
Usage: Ornamental groundcover for rock gardens; historical herbal remedy for minor ailments.
