PlantFun
Plant Needs
Sunlight
Requires full sun to partial shade; at least 6 hours of direct daily sunlight supports maximum blooming and monarch caterpillar host suitability
Watering
Water deeply when the top 5 cm of soil is dry; drought-tolerant once established, avoid waterlogged soil
Temperature
Hardy to -30°C, tolerates hot, dry summer conditions; avoid prolonged frost exposure in wet soil
Characteristics
- Leaf: Opposite, oval to lanceolate, gray-green, velvety texture
- Flower: Umbel clusters of pale pink to lavender star-shaped blooms with reflexed petals
- Stem: Erect, hairy, exudes milky sap when damaged
Care Guide
Watering
Keep soil evenly moist during active growth to support bloom production
Fertilization
Apply a diluted, balanced organic feed once monthly. Avoid high-nitrogen fertilizers, which can reduce bloom production
Eggshell powder topdress：Crush thoroughly dried eggshells into a fine powder; sprinkle a thin layer on the soil surface around the base of the plant, avoiding direct contact with stems to prevent rotPruning
- Cut back spent flower clusters to encourage secondary blooming and prevent self-seeding if desired
- Trim dead foliage to ground level in late winter to make way for new spring growth
- Thin overcrowded stems in early spring to improve airflow and reduce fungal disease risk
Toxicity
Warning: this plant may be toxic.
Pets & Humans
Pets: ASPCA: Contains cardiac glycosides; toxic if ingested, may cause severe cardiac and neurological effects
Humans: Milky sap may cause skin or eye irritation; ingestion leads to mild gastrointestinal upset
Garden Uses & Culture
Culture: Symbolizes pollinator conservation and support for monarch butterfly populations, a critical host plant for monarch caterpillars
Usage: Pollinator garden plant, native landscape restoration, cut flower with short vase life
