Friar's Cowl (Arisarum vulgare)

Friar's Cowl

Arisarum vulgare

Its hooded spathes evoke medieval friar cowls, a quiet woodland gem. Herbaceous perennial; common name: Friar's Cowl.

Partial sun
1/week
Moderate
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Plant Needs

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Sunlight Partial to full shade; avoid direct midday sun to prevent leaf scorching
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Watering Water when the top 2 cm of soil feels dry; avoid overwatering to prevent root rot
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Temperature Tolerates mild frost down to 5°C; thrives in cool to temperate temperature ranges
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Characteristics

  • Leaf: Heart-shaped, glossy green basal leaves up to 15 cm in length
  • Flower: Hooded purple-brown spathe enclosing a slender spadix, resembling a friar’s cowl
  • Stem: Short, fleshy basal stems supporting leaves and inflorescences
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Care Guide

Watering

Keep soil evenly moist but not waterlogged

Fertilization

Apply diluted balanced liquid fertilizer once every 4 weeks. Avoid over-fertilizing to prevent leaf burn and excessive foliage growth

Composted banana peel tea:Steep fully composted banana peels in water for 24 hours; dilute 1:20 with water before applying as a root drench to avoid nutrient buildup
Pruning
  • Remove yellowing or damaged basal leaves at the base to maintain plant tidiness
  • Trim spent flower stalks after blooming to redirect energy to foliage growth
  • Divide overcrowded clumps in early spring to promote healthy root development
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Toxicity

Warning: this plant may be toxic.

Pets & Humans

Pets: ASPCA confirmed toxic; ingestion leads to oral pain, swelling, vomiting, and difficulty swallowing

Humans: Contains calcium oxalate crystals; ingestion causes oral and throat irritation; contact may irritate skin

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Garden Uses & Culture

Culture: N/A

Usage: Ornamental ground cover for shaded garden beds and rock gardens