Cypripedium formosanum

RHS Plant Profile

Formosan lady's slipper orchid

Synonyms

Cypripedium japonicum var. formosanum

Herbaceous Perennial

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A small, hardy orchid reaching a height of around 10cm. Two apical, ovate to round plicate leaves are produced which have veins that radiate outwards likea fan. The long, slender stem produces a whitish flower with flecks of light to dark pink in the spring.

Position

Partial shade

Soil Types

Clay, Loam, Sand

Max Height

Up to 10 cm

Max Spread

0.1-0.5 metres

Size

Time to Maturity: 2–5 years
Max Spread: 0.1-0.5 metres
Max Height: Up to 10 cm

Growing Conditions

Clay Loam Sand

Moisture: Moist but well–drained
pH: Alkaline or Neutral

Position

Partial shade

Aspect: East–facing or North–facing
Exposure: Sheltered
Hardiness

Hardiness Ratings

All ratings refer to the UK growing conditions unless otherwise stated. Minimum temperature ranges (in degrees C) are shown in brackets

H1A: under glass all year (>15C)
H1B: can be grown outside in the summer (10 - 15)
H1C: can be grown outside in the summer (5 - 10)
H2: tolerant of low temperatures, but not surviving being frozen (1 to 5)
H3: hardy in coastal and relatively mild parts of the UK (-5 to 1)
H4: hardy through most of the UK (-10 to -5)
H5: hardy in most places throughout the UK even in severe winters (-15 to -10)
H6: hardy in all of UK and northern Europe (-20 to -15)
H7: hardy in the severest European continental climates (< -20): H5

Colour & Scent

Season	Stem	Flower	Foliage	Fruit
Spring
Summer
Autumn
Winter

Botanical Details

Family: Orchidaceae
Native to GB/Ireland: No
Foliage: Deciduous
Habit: Columnar upright
Potentially harmful: Skin allergen. Wear gloves and other protective equipment when handling
Genus: Cypripedium are terrestrial orchids with slender rhizomes and soft fan-shaped leaves, spirally arranged or in opposite pairs. Flowers are born in racemes of up to 12 flowers during summer have white, pink, red or purple tepals and a yellow, white, pink or purple pouch
Name Status: Correct
Plant Range: C Taiwan

How to Grow

Cultivation

Grow in moist, fertile, leafy, humus-rich slightly alkaline soil in a sheltered site with dappled or partial shade - ideally with some morning sunshine. Provide an annual winter mulch of leaf mould

Propagation

Propagate by division in early or mid-spring and replant immediately. Some of the soil from the root ball, which contains beneficial fungi, should be planted with each division

Suggested planting locations and garden types

City and courtyard gardens
Underplanting of roses and shrubs
Flower borders and beds

Pruning

No pruning required, allow foliage to die down naturally

Pests

May be susceptible to slugs

Diseases

May be susceptible to grey moulds