PlantFun
Plant Needs
Sunlight
Full sun to partial shade; thrives in open disturbed areas and tolerates dry, exposed conditions
Watering
Water when the top 2 cm of soil is dry; drought-tolerant once established, avoid overwatering to prevent root rot
Temperature
Tolerates light frost down to 0°C; prefers temperate to warm growing conditions between 15–25°C
Characteristics
- Leaf: Oval to obovate, arranged in whorls below inflorescence, bright green with smooth margins
- Flower: Small yellow cyathia (false flowers) clustered at stem tips, surrounded by bright yellow bracts
- Stem: Upright, branching near the top; exudes thick milky white sap when broken
Care Guide
Watering
Keep soil slightly moist during active growth periods
Fertilization
Optional diluted compost tea every 2 months. No regular fertilization is needed, as it thrives in low-nutrient soils
Composted eggshell powder：Sprinkle a thin layer of finely ground, fully composted eggshells on the soil surface to boost calcium levels and deter slugs; avoid direct contact with stems to prevent irritationPruning
- Remove spent flower heads to prevent unwanted self-seeding in managed garden spaces
- Trim back dying foliage in late summer after the plant has set seed
- Pull entire plants by the root if controlling spread as an invasive weed
Toxicity
Warning: this plant may be toxic.
Pets & Humans
Pets: ASPCA: Toxic; milky sap irritates mouth and digestive tract, causing drooling, vomiting, and diarrhea
Humans: Milky sap causes skin and eye irritation; ingestion leads to oral pain, nausea, and gastrointestinal distress
Garden Uses & Culture
Culture: N/A
Usage: Historically used topically to treat warts (caution: sap can cause skin damage); classified as an invasive weed in some agricultural regions
