• AGM plants

    AGM plants have been through a rigourous 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

Viburnum opulus 'Roseum'

Snowball

AGM plants

AGM plants have been through a rigourous 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
Snowball

© � RHS 2002

  • Other common names Snowball
    Snowball tree

    Red snowball tree
    Red guelder rose
    Rose elder
    Whitsuntide boss

    see more
  • Synonyms Viburnum opulus 'Sterile'

  • Genus Viburnum can be deciduous or evergreen shrubs with opposite, simple or palmately lobed leaves and clusters of small, often fragrant white or pink flowers, followed by red, blue or black berries

  • Family Adoxaceae / Adoxaceae

  • Species 'Roseum' is a large, bushy deciduous shrub with 3- to 5-lobed leaves turning reddish in autumn. Creamy-white sterile flowers in dense rounded clusters to 6cm in width. No fruit

Characteristics

  • Foliage Deciduous

  • Habit Bushy

  • Toxicity The fruit can cause a mild stomach upset if ingested

  • 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)
    Old hardiness ratings

    While we update our systems with the new hardiness ratings you may still see old hardiness ratings in your search results. These are denoted as 'Old'.

    • H1 - Requires heated glass
    • H2 - Requires unheated glass
    • H3 - Hardy outside in some regions of the UK
    • H4 - Hardy throughout the UK
    • H1 + H3 - Requires heated glass but may be grown outside in summer

    For full details of the hardiness ratings see

    see more

    H6

Colour

Sunlight

  • Full Sun

  • Partial Shade

  • Full Shade

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

  • Exposure Sheltered or Exposed

Soil

  • Chalk

    Clay

  • Chalk

    Loam

  • Chalk

    Sand

  • Chalk

    Chalk

  • MoistureWell-drained, Moist but well-drained

  • SoilClay, Loam, Sand, Chalk

  • pHAcid, Alkaline, Neutral

Size

  • Ultimate height

    2.5-4 metres

  • Ultimate spread

    2.5-4 metres

  • Time to ultimate height

    5-10 years

How to grow

Cultivation Grows well in most moderately fertile, humus-rich, well-drained soils

Propagation Propagate by seed, softwood and semi-hardwood cuttings

Suggested planting locations and garden types Hedging & Screens Low Maintenance Wildlife Gardens

How to care

Pruning Pruning group 8. Tolerates hard renovative pruning

Pests Aphids and viburnum beetle may be a problem

Diseases May be affected by a leaf spot

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