PlantFun
Plant Needs
Sunlight
Full sun to partial shade; tolerates dappled woodland shade for reduced flowering
Watering
Water deeply when top 5 cm of soil is dry; drought-tolerant once established
Temperature
Cold hardy to USDA zone 3; withstands winter frost and summer heat up to 35°C
Characteristics
- Leaf: Lance-shaped, toothed, medium green leaves arranged alternately along stems
- Flower: Clusters of tiny yellow composite flowers along upper stem axils
- Stem: Smooth, blue-green to purplish stems with upright growth habit
Care Guide
Watering
Keep soil evenly moist during active growth; avoid waterlogging
Fertilization
Light diluted feed once monthly. Use low-nitrogen feed to avoid excessive foliage growth
Eggshell powder topdress：Sprinkle finely crushed, dried eggshells around plant base; avoid direct stem contact to prevent rotPruning
- Deadhead spent blooms to encourage prolonged flowering and prevent self-seeding
- Cut back stems to ground level in late winter to promote vigorous new spring growth
- Thin overcrowded clumps every 2-3 years to improve airflow and reduce disease risk
Toxicity
Warning: this plant may be toxic.
Pets & Humans
Pets: ASPCA: Non-toxic to cats; no reported toxicity
Humans: Non-toxic to humans; no known adverse health effects from ingestion or contact
Garden Uses & Culture
Culture: Symbolizes encouragement and pollinator conservation in native wildflower gardening
Usage: Pollinator-friendly wildflower for bees and butterflies; cut flower for dried arrangements
