Pyrenean Butterbur (Petasites pyrenaicus)

Pyrenean Butterbur

Petasites pyrenaicus

Large, lush leaves form a dense groundcover, softening shaded garden edges. Herbaceous perennial; common name: Pyrenean butterbur.

Low light
1–2/week
Moderate
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Plant Needs

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Sunlight Partial to full shade; avoid direct midday sun which scorches large leaves
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Watering Keep soil consistently moist but not waterlogged; avoid allowing the root zone to dry out completely
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Temperature Hardy to -10°C; prefers cool temperate conditions; avoid extreme heat above 28°C
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Characteristics

  • Leaf: Large, rounded heart-shaped basal leaves up to 1m wide; fuzzy texture on undersides
  • Flower: Dense clusters of pale pink to white composite flowers on thick, fleshy stems
  • Stem: Thick, succulent flowering stems with small scale-like bracts
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Care Guide

Watering

Maintain consistent soil moisture; apply mulch to retain water

Fertilization

Apply diluted organic feed once monthly. Use nitrogen-rich organic feed to support robust leaf growth

Composted banana peel tea:Steep fully composted banana peels in water for 24 hours; dilute 1:20 for root drench; avoid raw peels to prevent pest infestations
Pruning
  • Remove spent flower stems after blooming to redirect energy to foliage growth
  • Thin overcrowded clumps in early spring to improve airflow and reduce disease risk
  • Cut back dying 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 cause vomiting, diarrhea, and liver damage with prolonged exposure

Humans: Contains pyrrolizidine alkaloids; chronic ingestion causes liver damage; skin irritation from contact

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Garden Uses & Culture

Culture: N/A

Usage: Ornamental groundcover for shaded, moist sites; traditional medicinal use requires specialized processing to remove toxic alkaloids