Butterbur (Petasites hybridus)

Butterbur

Petasites hybridus

Its broad leaves form lush ground cover, a quiet green carpet in damp shade. Herbaceous perennial; common name: butterbur.

Low light
2–3/week
Moderate
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Plant Needs

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Sunlight Prefers partial to full shade; avoid direct midday sunlight which can scorch its large leaves
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Watering Keep soil consistently moist but not waterlogged; tolerates damp, boggy growing conditions
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Temperature Hardy to -15°C; thrives in cool temperate conditions; avoid prolonged temperatures above 25°C
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Characteristics

  • Leaf: Large, round heart-shaped basal leaves with fuzzy undersides and long, sturdy petioles
  • Flower: Dense pale pink or white cylindrical flower heads borne on leafless, succulent stems
  • Stem: Thick, fleshy flowering stems emerge prior to foliage in early spring
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Care Guide

Watering

Maintain even soil moisture; increase frequency during hot, dry spells

Fertilization

Apply diluted organic feed once monthly. Use low-nitrogen organic fertilizer to support foliage growth without promoting excessive stem elongation

Composted banana peel tea:Steep fully composted banana peels in water for 24 hours; dilute 1:20 before applying to soil surface to avoid nutrient burn
Pruning
  • Remove spent flower stems immediately after blooming to redirect energy to foliage development
  • Thin overcrowded clumps in early spring to improve airflow and reduce fungal disease risk
  • Cut back dead or damaged foliage in late autumn to tidy the planting area
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Toxicity

Warning: this plant may be toxic.

Pets & Humans

Pets: ASPCA: Toxic; ingestion may lead to vomiting, diarrhea, lethargy, and potential liver impairment with repeated exposure

Humans: Contains pyrrolizidine alkaloids; chronic ingestion may cause liver damage; acute exposure causes mild oral irritation

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Garden Uses & Culture

Culture: N/A

Usage: Traditional medicinal use (requires specialized processing to remove toxic alkaloids); ornamental ground cover for damp shade