PlantFun
Plant Needs
Sunlight
Full sun to partial shade; thrives in open, sunny meadows and tolerates mild afternoon shade in hot climates
Watering
Drought-tolerant once established; water deeply but infrequently to avoid waterlogging and root rot
Temperature
Hardy to USDA zones 8–10; tolerates mild frost and high summer heat with adequate drainage
Characteristics
- Leaf: Narrow lanceolate leaves with fuzzy undersides, arranged oppositely on stems
- Flower: Dense umbels of pale pink to lavender star-shaped blooms with reflexed petals
- Stem: Erect, hairy stems that exude milky sap when broken
Care Guide
Watering
Water deeply every 7–10 days during prolonged dry spells
Fertilization
Avoid regular fertilization; native plants thrive in low-fertility soil. Do not use high-nitrogen fertilizers, as they can reduce flower production
Composted eggshell powder：Sprinkle a thin layer of crushed, composted eggshells on soil surface in early spring; avoid raw eggshells to prevent pest attractionPruning
- Deadhead spent blooms to encourage extended flowering and control self-seeding if desired
- Cut back stems to ground level in late autumn to promote healthy new growth in spring
- Remove diseased or damaged foliage promptly to reduce pest and disease spread
Toxicity
Warning: this plant may be toxic.
Pets & Humans
Pets: ASPCA: Toxic due to cardiac glycosides; may cause vomiting, diarrhea, weakness, irregular heartbeat, or collapse
Humans: Ingestion of large quantities causes nausea, vomiting, and abdominal discomfort; milky sap may irritate skin
Garden Uses & Culture
Culture: Primary host plant for monarch butterfly caterpillars; symbolizes ecological conservation and pollinator support
Usage: Native pollinator garden plant; supports bees, butterflies, and other beneficial insects
