Sparrow's Egg Lady's Slipper (Cypripedium passerinum)

Sparrow's Egg Lady's Slipper

Cypripedium passerinum

Its slipper-shaped blooms hold delicate, egg-like markings. Perennial terrestrial orchid; common name: Sparrow's Egg Lady's Slipper.

Partial sun
1–2/week
Moderate
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Plant Needs

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Sunlight Bright indirect or dappled sunlight; avoid harsh midday direct sun to prevent leaf scorch
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Watering Keep soil consistently moist but not waterlogged; use rainwater or distilled water to avoid mineral buildup
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Temperature Extremely cold-hardy; prefers cool summer temperatures below 25°C to support blooming
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Characteristics

  • Leaf: Oval to lanceolate, pleated, medium green, arranged in a basal rosette
  • Flower: Single white slipper-shaped pouch with purple-brown markings; lateral petals twisted
  • Stem: Slender, hairy green stem bearing 3–5 leaves
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Care Guide

Watering

Keep soil evenly moist; avoid drying out completely

Fertilization

Diluted balanced orchid fertilizer once every 2 weeks. Avoid over-fertilizing to prevent root burn; flush soil monthly to remove salt buildup

Composted pine needle tea:Steep fully composted pine needles in water for 24 hours; dilute 1:20 for root drench to maintain acidic soil pH and support mycorrhizal growth
Pruning
  • Remove spent flower stems after blooming to redirect energy to rhizome growth
  • Trim yellowing basal leaves to improve airflow and reduce disease risk
  • Divide overcrowded clumps every 3–5 years in early spring to promote healthy growth
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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: N/A

Usage: Ornamental garden plant; targeted for native wildflower conservation efforts