• 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

Physocarpus opulifolius 'Diabolo' (PBR)

ninebark 'Diabolo'

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
  • Other common names ninebark 'Diabolo'

  • Synonyms Physocarpus opulifolius 'Monlo'

  • Family Rosaceae

  • Genus Physocarpus are bushy deciduous suckering shrubs with palmately lobed leaves and corymbs of small cream flowers in early summer, followed by small, bladdery brown fruits

  • Details 'Diabolo' is a deciduous shrub with deep purple, three-lobed leaves and clusters of small white, pink-tinged flowers in summer

Characteristics

  • Foliage Deciduous

  • Habit Suckering

  • 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)

    H7

Colour

Sunlight

  • Full Sun

  • Partial Shade

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

  • Exposure Exposed or Sheltered

Soil

  • Clay

    Clay

  • Sand

    Sand

  • Loam

    Loam

  • MoistureWell-drained, Moist but well-drained

  • SoilClay, Sand, Loam

  • pHAcid, Neutral

Size

  • Ultimate height 1.5-2.5 metres

  • Ultimate spread 1.5-2.5 metres

  • Time to ultimate height 5-10 years

How to grow

Cultivation Grows best in acidic, moderately fertile, humus-rich soil but will tolerate alkaline soils. Chlorosis may occur if grown in shallow chalky soil

Propagation Propagate by softwood cuttings in summer or pot up rooted suckers in autumn or spring

Suggested planting locations and garden types Flower borders and beds Cottage & Informal Garden

How to care

Pruning Pruning group 2

Pests Generally pest free

Diseases Generally disease free

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