PlantFun
Plant Needs
Sunlight
Full sun to partial sun; tolerates dry, disturbed roadside and agricultural soils
Watering
Drought-tolerant; water only during prolonged dry spells to avoid overwatering
Temperature
Thrives in warm temperate to subtropical climates; cannot tolerate frost or freezing temperatures
Characteristics
- Leaf: Alternate, heart-shaped to ovate, coarsely toothed margins, rough hairy texture
- Flower: Inconspicuous greenish male heads at stem tips; female heads develop into spiny burs
- Stem: Erect, branched, covered in short stiff hairs
Care Guide
Watering
Water sparingly only when top 5–7 cm of soil is completely dry
Fertilization
No regular fertilization required; tolerates nutrient-poor soils. Fertilization may encourage aggressive spread in managed areas
Eggshell powder topdress：Crush dried eggshells into fine powder; lightly dust soil surface to add calcium without overstimulating growthPruning
- Remove mature spiny burs to prevent seed dispersal via animal fur or clothing
- Cut back dead stems in autumn to reduce overwintering seed banks
- Clear surrounding plants to limit competition in managed garden areas
Toxicity
Warning: this plant may be toxic.
Pets & Humans
Pets: ASPCA: Toxic; ingestion leads to vomiting, diarrhea, and potential liver failure
Humans: Contains carboxyatractyloside; ingestion causes gastrointestinal distress and liver damage
Garden Uses & Culture
Culture: N/A
Usage: N/A
