• 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

yellow lady's slipper orchid

© RHS

  • Other common names yellow lady's slipper orchid

  • Synonyms Cypripedium calceolus var. calceolus

  • Family Orchidaceae

  • Genus Cypripedium are terrestrial orchds with erect, leafy stems growing from slender rhizomes and bearing solitary or racemose flowers comprising three spreading tepals and an inflated ppuch-like lip

  • 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

Advertise here

Did you find the information you were looking for?

RHS members can get exclusive individual advice from the RHS Gardening Advice team.

Join the RHS now