• 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

Cobaea scandens

cup and saucer vine

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
cup and saucer vine

© RHS

  • Other common names cup and saucer vine
    cathedral bells

    cups and saucers
    Mexican ivy
    monastery bells

    see more
  • Family Polemoniaceae

  • Genus Cobaea can be woody or herbaceous climbers with pinnate leaves bearing a branched tendrils, and large, solitary, bell-shaped flowers in the upper leaf axils

  • Details C. scandens is a vigorous perennial climber, usually grown as an annual, with pinnate leaves and fragrant, bell-shaped flowers 5cm in length, which change from greenish-white to purple

  • Plant range Mexico (Puebla)

Characteristics

  • Foliage Evergreen

  • Habit Climbing

  • 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)

    H2

Colour

Sunlight

  • Full Sun

  • Aspect South-facing or West-facing

  • Exposure Sheltered

Soil

  • Chalk

    Chalk

  • Clay

    Clay

  • Sand

    Sand

  • Loam

    Loam

  • MoistureMoist but well-drained

  • SoilChalk, Clay, Sand, Loam

  • pHAcid, Alkaline, Neutral

Size

  • Ultimate height 2.5-4 metres

  • Ultimate spread 0.5-1 metres

  • Time to ultimate height 1-2 years

How to grow

Cultivation Needs a sheltered, sunny wall or trellis and moist but well-drained soil for the best flowers

Propagation Propagate by seed or softwood cuttings

Suggested planting locations and garden types Wall-side Borders

How to care

Pruning Pruning group 11 after flowering

Pests Generally pest free

Diseases Generally disease free

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