PlantFun
Plant Needs
Characteristics
- Leaf: Opposite, oblong to linear leaves with translucent oil glands (visible as dots when held to light)
- Flower: Bright yellow, five-petaled blooms with numerous stamens; clusters at stem tips
- Stem: Erect, branching green stems with slight reddish tints in full sun
Care Guide
Keep soil consistently moist but not waterlogged; avoid wetting foliage to reduce fungal disease risk
Diluted balanced organic feed every 4 weeks. Avoid high-nitrogen fertilizers, which can reduce flowering and promote excessive leaf growth
Eggshell powder topdress：Crush dried eggshells into a fine powder, sprinkle 1 teaspoon per plant around the base, and water gently to release calcium into the soil- Deadhead spent blooms regularly to encourage extended flowering through mid-summer
- Cut back stems to 10–15 cm above soil level in late autumn to promote dense new growth the following spring
- Remove weak, diseased, or damaged stems in early spring to improve airflow and reduce disease risk
Toxicity
Warning: this plant may be toxic.
Pets: ASPCA: Toxic; ingestion may cause vomiting, diarrhea, lethargy, and photosensitivity
Humans: Contains hypericin; causes phototoxic skin reactions with sun exposure; severe drug interactions with antidepressants, blood thinners, and other medications
Garden Uses & Culture
Culture: Associated with St. John the Baptist; used in traditional European folk medicine for mood support and wound care
Usage: Medicinal herb (consult a healthcare provider before use); ornamental garden plant for borders and wildflower meadows
