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Slipper Orchid (Cypripedium macranthos)

Slipper Orchid (Cypripedium macranthos)

Cypripedium macranthos is commonly known as the Large-flowered Cypripedium and is a slow growing species of orchid. With it's spectacular flowers this plant has gained much renown. The flower heads are large, around 7.5cm in diameter. It will flower in the spring and the flowers will last until early summer. It will grow best in sandy, well-drained soil. It will grow best in partial shade.

Sowing medium: “Standard medium” with the addition of 1 cm3 turnip in each flask à 20 ml medium.
Sowing time: April-June, possibly July.
Seed treatment: Thin seed coats, normally 0,3-0,5% NaClO for 4-8 minutes.
Germination: In some cases after 2 days, in most cases 2-4 weeks.
Growth on medium: One transplanting to fresh medium at 3-5 mm size. They produce nice little tubers on medium after 7-10 months, to be potted in soil early next summer.
Potting in soil:
Standard soil from lime-stone areas or similar, possibly with a little sand added to give good drainage. The little tubers from medium should be kept “dry” but not “too dry” first summer in soil. A simple trick is to add “a little” water to the pot when the soil has dried out, and then put it all in a plastic bag for 4-5 months. After given water from Sept or Oct, 75-95% of the tubers will develop leaves.

Read more about growing wild orchids  >>>

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