• 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

Hoya carnosa

wax plant

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
wax plant

© RHS

  • Other common names wax plant
    fleshy-leaved wax flower

    porcelain flower

    see more
  • Family Apocynaceae

  • Genus Hoya are evergreen perennials, often twining climbers, with simple, leathery leaves and often fragrant flowers with 5 spreading waxy petals, followed by slender, spindle-shaped pods contained small seeds in copious silky floss

  • Details H. carnosa is a vigorous evergreen stem-rooting climber to 5m, with rigid, fleshy dark green leaves and umbels of night-scented, waxy, red-centred, white or pale pink flowers 15mm across

  • Plant range C China to Australia

Characteristics

  • Foliage Evergreen

  • Habit Climbing

  • Fragrance Flower

  • 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

  • Exposure Sheltered

Soil

  • Loam

    Loam

  • Chalk

    Chalk

  • Sand

    Sand

  • MoistureWell-drained

  • SoilLoam, Chalk, Sand

  • pHAcid, Alkaline, Neutral

Size

  • Ultimate height 4-8 metres

  • Ultimate spread 1-1.5 metres

  • Time to ultimate height 10-20 years

How to grow

Cultivation Grow outdoors in moist but well-drained soil in a sheltered, frost-free area with protection from drying winds. Grow under glass in loam-based compost in bright filtered light. Maintain moderate humidity. Provide support

Propagation Propagate by seed, semi-hardwood cuttings or by layering in spring or summer

Suggested planting locations and garden types Sub-tropical Patio & Container Plants

How to care

Pruning Pruning group 11

Pests Prone to mealybugs under glass

Diseases Generally disease free

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