• 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

Catharanthus roseus

rose periwinkle

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
rose periwinkle

© RHS

  • Other common names rose periwinkle
    cayenne jasmine

    Madagascar periwinkle
    old maid

    see more
  • Family Apocynaceae

  • Genus Catharanthus can be annuals or perennials with simple, paired leaves and solitary or clustered, 5-petalled flowers at the branch tips

  • Details C. roseus is a woody-based evergreen perennial, to 45cm in height, with somewhat fleshy stems bearing ovate leaves and 5-petalled flowers, to 4cm across, pink, red or white in colour

  • Plant range Madagascar

Characteristics

  • Foliage Evergreen

  • Habit Bushy

  • 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)

    H1C

Colour

Sunlight

  • Full Sun

  • Aspect South-facing or East-facing

  • Exposure Sheltered

Soil

  • Sand

    Sand

  • Chalk

    Chalk

  • Loam

    Loam

  • MoistureWell-drained, Moist but well-drained

  • SoilSand, Chalk, Loam

  • pHAcid, Alkaline, Neutral

Size

  • Ultimate height 0.1-0.5 metres

  • Ultimate spread 0.1-0.5 metres

  • Time to ultimate height 2-5 years

How to grow

Cultivation Grow under glass in a loam-based potting compost with full light and good ventilation. When in growth water moderately and apply a balanced liquid fertiliser monthly. Water sparingly in winter. Can be grown outdoors as summer bedding in most moderately fertile, moist but well-drained soils

Propagation Propagate by seed sown in early spring at 13 to 18°C, or by softwood cuttings in late spring or semi-hardwood cuttings in summer

Suggested planting locations and garden types Flower borders and beds Garden Edging Ground Cover Underplanting of Roses and Shrubs City & Courtyard Gardens Cottage & Informal Garden Gravel Garden Mediterranean Climate Plants Patio & Container Plants

How to care

Pruning No pruning required

Pests Glasshouse red spider mite and glasshouse whitefly may be a problem

Diseases Generally disease free

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