Alpine Butterbur (Petasites paradoxus)

Alpine Butterbur

Petasites paradoxus

Large, rounded leaves carpet mountain slopes like soft green shields. Perennial herbaceous plant; common name: Alpine Butterbur.

Partial sun
2–3/week
Moderate
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Plant Needs

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Sunlight Prefers partial to full shade; avoid direct midday sun which can scorch 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 Cold-hardy to subzero temperatures; tolerates cool summer conditions but struggles in extreme heat
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Characteristics

  • Leaf: Large, rounded cordate basal leaves up to 80 cm wide; dark green with slightly fuzzy upper surfaces
  • Flower: Dense cylindrical clusters of pale pink or white florets on thick, fleshy stems
  • Stem: Hollow, pale green flowering stems with scale-like bracts
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Care Guide

Watering

Maintain consistent soil moisture; water deeply when the top 2 cm of soil feels dry

Fertilization

Apply diluted organic feed once monthly. Use low-nitrogen organic feed to support healthy root and foliage development

Composted banana peel tea:Steep fully composted banana peels in water for 24 hours; dilute 1:20 for root drench to avoid nutrient burn and odor
Pruning
  • Trim spent flower stems after blooming to redirect energy to foliage growth
  • Thin overcrowded basal leaves in late summer to improve airflow and reduce disease risk
  • Cut back dead foliage to soil level in late autumn to prepare for winter dormancy
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Toxicity

Warning: this plant may be toxic.

Pets & Humans

Pets: ASPCA: Toxic due to pyrrolizidine alkaloids; may cause vomiting, diarrhea, and liver injury with prolonged ingestion

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: Ornamental ground cover for shaded moist areas; limited traditional medicinal use restricted due to toxicity risks