Calanthe sieboldii Rhizomes

Calanthe sieboldii is one of the most striking Japanese terrestrial orchids, valued for its tall flower spikes and bright yellow blooms.

This clump-forming perennial produces elegant spring flowers above large ribbed leaves, creating a dramatic feature in woodland gardens.

• Height: up to 60cm
• Spread: 40–50cm
• Flower colour: bright yellow, sometimes marked with brown
• Flowering time: April to May
• Position: partial shade to shade
• Soil: humus-rich, moist but well-drained soil

About Calanthe sieboldii

Calanthe sieboldii grows from underground rhizomes and forms clumps of broad, heavily ribbed light green leaves.

In spring, tall stems emerge carrying clusters of large pale yellow flowers.

The blooms often feature a brighter lemon-yellow lip, sometimes marked with small brown spots.

The flowers may carry a light fragrance depending on the plant.

This species is known for its long flowering period compared with many other terrestrial orchids.

The tall flower spikes and fresh foliage give it strong presence in shaded garden planting.

Benefits for UK Wildlife

Calanthe sieboldii adds diversity to woodland garden habitats.

• Flowers may attract pollinating insects
• Provides nectar during spring
• Supports biodiversity in shaded planting areas

Plant with other woodland perennials to create a varied habitat.

Where to Grow Calanthe sieboldii

• Woodland gardens
• Shaded borders
• Under deciduous trees
• Naturalistic shade planting
• Collectors’ plant gardens

This orchid pairs well with ferns, hostas, and trilliums in woodland-style planting.

Planting Tips

• Plant rhizomes in spring or autumn.
• Choose a shaded or partially shaded position.
• Use humus-rich soil improved with leaf mould.
• Plant rhizomes just below the soil surface.
• Keep soil evenly moist during the growing season.

A yearly mulch of leaf mould helps maintain suitable woodland conditions.

Why Grow Calanthe sieboldii

• Large bright yellow orchid flowers
• Long spring flowering period
• Architectural ribbed foliage
• Excellent woodland garden plant
• Rare and distinctive perennial orchid

If you enjoy unusual woodland plants, Calanthe sieboldii offers impressive yellow blooms and elegant foliage for shaded garden spaces.