• 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

Hydrangea aspera subsp. sargentiana

Sargent hydrangea

Sargent hydrangea

© RHS 2001

  • Other common names Sargent hydrangea

  • Synonyms Hydrangea sargentiana

  • Family Hydrangeaceae

  • Genus Hydrangea can be deciduous or evergreen shrubs, or self-clinging climbers, with flowers in clusters usually comprising both small fertile and more showy sterile flowers; often good autumn colour

  • Details H. aspera subsp. sargentiana is an upright medium-sized deciduous shrub of open habit, with peeling bark and large, velvety ovate leaves. Flowers in large flat heads, purple or blue, surrounded by white ray florets

  • Plant range China


  • Foliage Deciduous

  • Habit Bushy

  • Toxicity May cause 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)




  • Full Sun

  • Partial Shade

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

  • Exposure Sheltered or Exposed


  • Chalk


  • Chalk


  • Chalk


  • MoistureWell-drained, Moist but well-drained

  • SoilSand, Clay, Loam

  • pHAcid, Neutral


  • Ultimate height 1.5-2.5 metres

  • Ultimate spread 1.5-2.5 metres

  • Time to ultimate height 10-20 years

How to grow

Cultivation Grow in moist but well-drained soil in full sun or partial shade

Propagation Propagate by softwood cuttings

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

How to care

Pruning Pruning group 1

Pests Aphids, capsid bug and hydrangea scale may be a problem

Diseases May be subject to a leaf spot

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