PlantFun
Plant Needs
Sunlight
Thrives in full sun to partial shade; tolerates dry, nutrient-poor disturbed soils
Watering
Water deeply when the top 2–3 cm of soil is dry; drought-tolerant once established
Temperature
Hardy to mild frosts; performs best in temperate summer temperatures between 15–25°C
Characteristics
- Leaf: Opposite, ovate to broad-lanceolate leaves with serrated margins and soft, dense pubescence
- Flower: Tubular purple to pinkish bilabiate flowers arranged in whorls at upper leaf axils
- Stem: Square, hairy stem characteristic of the mint family
Care Guide
Watering
Keep soil moderately moist during active growth; reduce watering only if plants show signs of wilting
Fertilization
No regular fertilization required; avoid high-nitrogen feeds that promote foliage over flowering. A light application of compost in early spring may support healthy growth
Composted eggshell powder：Sprinkle a thin layer around the base of plants; avoid direct contact with stems to prevent potential burnPruning
- Deadhead spent flower whorls to prolong the blooming period
- Thin overcrowded plants to improve airflow and reduce disease risk
- Remove entire plants after flowering to control self-seeding if desired
Toxicity
Warning: this plant may be toxic.
Pets & Humans
Pets: ASPCA: Toxic due to pyrrolizidine alkaloids; ingestion may lead to vomiting, diarrhea, and liver injury
Humans: Contains pyrrolizidine alkaloids; prolonged ingestion may cause liver damage; skin contact may cause mild irritation
Garden Uses & Culture
Culture: N/A
Usage: Wildflower meadow planting; historically used in folk medicine (not recommended due to toxicity)
