PlantFun
Plant Needs
Sunlight
Full sun to partial shade; tolerates mild afternoon shade in hot, arid climates to prevent leaf scorch
Watering
Water deeply when the top 2–3 cm of soil is dry; avoid overwatering to prevent root rot and fungal growth
Temperature
Extremely cold-hardy to -30°C; tolerates summer heat up to 30°C; protect young plants from strong, drying winds
Characteristics
- Leaf: Simple, ovate to lanceolate leaves with serrated margins; glossy green, arranged alternately on stems
- Flower: Buds inflate into balloon-like spheres before opening to 5-lobed star-shaped blooms in blue, white, or pink
- Stem: Erect, slender green stems with minimal branching; exude milky sap when broken
Care Guide
Watering
Keep soil consistently moist but not waterlogged; increase watering frequency during prolonged hot, dry spells
Fertilization
Apply a balanced slow-release fertilizer once at the start of the growing season. Avoid high-nitrogen fertilizers, which can promote excessive foliage growth at the expense of flower production
Eggshell powder topdressing：Crush thoroughly dried eggshells into a fine powder; sprinkle 1 tablespoon of powder around the base of each plant and water gently to release calcium into the soilPruning
- Deadhead spent blooms regularly to encourage extended flowering throughout the summer
- Cut back stems to 5 cm above the soil surface after the first frost to prepare the plant for winter dormancy
- Thin overcrowded clumps in early spring to improve airflow and light penetration, reducing disease risk
Toxicity
Warning: this plant may be toxic.
Pets & Humans
Pets: ASPCA: Non-toxic to cats; safe for feline exposure
Humans: Non-toxic to humans; no known adverse effects from ingestion or contact
Garden Uses & Culture
Culture: Symbolizes unchanging love and honesty in traditional Korean folklore; often used in wedding bouquets
Usage: Ornamental garden plant; dried roots are used in traditional East Asian herbal medicine to treat respiratory issues
