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PlantSnap
Plant Care
Large-flowered lady's slipper
(Cypripedium macranthos)
Also Known As
Large-flowered lady's slipper, Large yellow lady's slipper, Showy lady's slipper, Big yellow orchid
About This Plant
Cypripedium macranthos is a species of lady's slipper orchid. It is native to Asia, specifically China, Japan, Korea, and Russia. The plant has a single stem with one or two leaves and one or two flowers. The flowers are pink or purple with a white or yellow center. It is a rare and endangered species due to habitat loss and over-collection.
Plant Care Instructions
Outdoor Size Range
18-24 inches (45-60 cm)
Light Requirements
Cypripedium macranthos prefers bright, indirect light. Direct sunlight can scorch the leaves and flowers.
Humidity Needs
Cypripedium macranthos requires high humidity levels, around 70-80%. Use a humidifier or place the plant on a tray of pebbles filled with water to increase humidity.
Fertilizing Schedule
Fertilize the plant every 2-3 weeks during the growing season with a balanced fertilizer. Do not fertilize during the dormant season.
Pruning Guidelines
Remove dead leaves and flowers as needed. Do not prune the stem unless it is completely dead.
Common Pests and Diseases
Common pests include spider mites, mealybugs, and scale insects. Watch for signs of infestation and treat with insecticidal soap or neem oil.
Indoor Size Range
10-12 inches (25-30 cm)
Watering Schedule
Water the plant when the top inch of soil is dry. Do not let the soil dry out completely or become waterlogged.
Temperature Range
The plant prefers cool temperatures, around 60-70°F (15-21°C) during the day and 50-60°F (10-15°C) at night.
Growing Season
Cypripedium macranthos blooms in the spring and summer.
Growing Difficulty Level
Cypripedium macranthos is considered difficult to grow due to its specific light, humidity, and temperature requirements.
USDA Hardiness Zones
Cypripedium macranthos is hardy in USDA zones 3-8.
Did You Know?
Cypripedium macranthos is the official flower of the Japanese island of Hokkaido.
