Pink Lady's Slipper (Cypripedium acaule)

Pink Lady's Slipper

Cypripedium acaule

Its pouch-shaped blooms hold quiet woodland charm. Terrestrial orchid; common name: Pink Lady's Slipper.

Partial sun
1–2/week
Moderate
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Plant Needs

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Sunlight Dappled woodland shade; avoid direct midday sun to prevent leaf scorch
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Watering Keep soil consistently moist but well-drained; avoid waterlogging to protect fragile roots
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Temperature Hardy to -20°C; prefers cool, temperate woodland conditions with mild summer temperatures
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Characteristics

  • Leaf: Two broad, oval basal leaves, glossy green, 10–25 cm long
  • Flower: Solitary pink pouch-shaped bloom with twisted brownish-purple sepals and petals
  • Stem: Slender, hairless stem bearing a single flower above the basal leaves
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Care Guide

Watering

Keep soil evenly moist; apply mulch to retain moisture and regulate soil temperature

Fertilization

Diluted low-nitrogen orchid fertilizer once every 4 weeks. Avoid high-nitrogen fertilizers to prevent leaf burn and promote healthy blooming

Composted leaf mold tea:Steep fully composted leaf mold in water for 24 hours; dilute 1:20 for root drench to avoid nutrient overload
Pruning
  • Remove spent flower stems after blooming to redirect energy to root and leaf growth
  • Trim yellowing basal leaves at the base to maintain plant appearance and reduce disease risk
  • Avoid disturbing the fragile mycorrhizal root system during cultivation or transplanting
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Toxicity

Warning: this plant may be toxic.

Pets & Humans

Pets: ASPCA: Non-toxic to cats

Humans: No known toxic effects on humans

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Garden Uses & Culture

Culture: Symbolizes rarity and delicate woodland beauty in North American folklore

Usage: Ornamental garden plant; protected in some regions due to habitat loss and slow growth rate