Yellow lady's slipper
Cypripedium calceolus
Description
The Yellow lady's slipper (Cypripedium calceolus) is a perennial herbaceous plant belonging to the Orchidaceae family. It is arguably the most famous European orchid, prized for its large, bright yellow pouch-like labellum and dark, twisted petals.
Native to a wide range of temperate habitats across Europe and Asia, the plant has evolved to survive in deciduous forests and limestone-rich meadows. In professional horticulture, it is treated as a high-maintenance crop that requires specific environmental conditions, including a symbiotic relationship with mycorrhizal fungi for successful establishment and growth.
From a botanical standpoint, the plant features a rhizomatous root system, which produces upright stems adorned with pleated leaves. The single complex flower appears between late spring and early summer. Its reproductive strategy is highly specialized, relying on specific insects for cross-pollination, which is a key factor to consider when maintaining greenhouse populations.
Agronomic requirements are stringent: the species demands well-drained, alkaline soils with consistent moisture levels. Unlike many greenhouse crops, it thrives in cool climates and requires protection from extreme summer heat. Soil structure should mimic forest floor conditions, avoiding dense or nutrient-overloaded substrates that could inhibit fungal activity.
The primary horticultural use of this species is in specialized gardens and botanical collections. Due to its status as a protected species in many regions, commercial production is focused on vegetative propagation or flask-grown seedlings. Common issues for the grower include managing slugs and snails, which can devastate the foliage, and preventing fungal infections in the rhizome due to improper irrigation.
- Maintain a semi-shaded environment to simulate forest canopy.
- Use substrates with high calcium content and excellent drainage.
- Avoid over-fertilization, especially with nitrogen-heavy formulas.
- Provide adequate winter mulch to protect the rhizome from freezing.