• AGM plants

    AGM plants have been through a rigorous trial and assessment programme. They are:

    • Excellent for ordinary use in appropriate conditions
    • Available to buy
    • Of good constitution
    • Essentially stable in form & colour
    • Reasonably resistant to pests & diseases

Cypripedium calceolus

yellow lady's slipper orchid

  • Other common names yellow lady's slipper orchid

  • Synonyms Cypripedium calceolus var. calceolus

  • Family Orchidaceae

  • 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

  • Details C. calceolus is a terrestrial orchid with soft, folded bright green leaves 5-20cm long. In summer bears purple-brown flowers 9cm long with twisted petals and large, deep yellow lips, singly or in pairs on upright stems to 40cm high

  • Plant range Europe to Japan

Characteristics

  • Foliage Deciduous

  • Habit Columnar/Upright

  • 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

Sunlight

  • Partial Shade

  • Aspect North-facing or West-facing or East-facing

  • Exposure Sheltered

Soil

  • Loam

    Loam

  • MoistureMoist but well-drained

  • SoilLoam

  • pHAcid, Alkaline, Neutral

Size

  • Ultimate height 0.1-0.5 metres

  • Ultimate spread 0-0.1 metre

  • Time to ultimate height 2-5 years

How to grow

Cultivation Grow in moist, fertile, leafy, humus-rich slightly alkaline soil in a sheltered site with dappled or partial shade. Provide an annual winter mulch of leaf mould. Suits a shady rock garden or woodland garden

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 Wall-side Borders Cottage & Informal Garden Wildlife Gardens

How to care

Pruning No pruning required

Pests Susceptible to slugs

Diseases May be affected by grey moulds

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