PlantFun
Plant Needs
Sunlight
Full sun to partial shade; tolerates dappled woodland light but produces fewer flowers in dense shade.
Watering
Water deeply during prolonged dry spells; avoid overwatering as established plants tolerate moderate drought.
Temperature
Hardy to -15°C; thrives in cool to temperate climates with mild summers.
Characteristics
- Leaf: Large, pinnately compound leaves with coarse, serrated leaflets and hairy undersides.
- Flower: Flat-topped umbels of tiny white flowers, up to 20 cm across.
- Stem: Thick, hollow, hairy stems with purple blotches in mature specimens.
Care Guide
Watering
Keep soil evenly moist during active growth; reduce watering only if plants show wilting
Fertilization
Apply diluted organic feed once at emergence to support early growth. Avoid high-nitrogen feeds to prevent leggy, weak stems.
Composted eggshell powder：Sprinkle a thin layer around the base in early spring; water thoroughly to release nutrients and support stem strength.Pruning
- Deadhead spent flower heads to prevent excessive self-seeding if natural spread is not desired.
- Cut back stems to ground level after flowering in autumn to tidy growth and prepare for winter dormancy.
- Remove damaged or yellowing leaves throughout the growing season to improve airflow and reduce disease risk.
Toxicity
Warning: this plant may be toxic.
Pets & Humans
Pets: ASPCA unlisted, but ingestion may cause mild gastrointestinal irritation and oral discomfort.
Humans: Contains furanocoumarins; skin contact followed by sunlight causes phytophotodermatitis (blistering, redness, hyperpigmentation).
Garden Uses & Culture
Culture: N/A
Usage: Wildlife nectar source for bees and butterflies; historical folk medicinal use for digestive and respiratory issues.
