• 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

Clethra alnifolia 'Paniculata'

Sweet pepper bush

Sweet pepper bush

© � RHS 2002

  • Other common names Sweet pepper bush
    Panicled white alder

  • Synonyms Clethra alnifolia var. paniculata
    Clethra paniculata

  • Genus Clethra can be deciduous or evergreen trees or shrubs, sometimes with attractive bark, with simple leaves and small, fragrant, usually white, bell-shaped flowers in racemes or panicles

  • Family Clethraceae / Clethraceae

  • Species 'Paniculata' is a bushy deciduous medium-sized shrub with finely-toothed, obovate leaves, and small fragrant white flowers in panicles at the shoot-tips


  • Foliage Deciduous

  • Habit Bushy

  • Fragrance Flower



  • Partial Shade

  • Full Shade

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

  • Exposure Sheltered


  • Chalk


  • Chalk


  • Chalk


  • MoistureMoist but well-drained

  • SoilLoam, Clay, Sand

  • pHAcid


  • 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, acidic soils in a sheltered position in partial shade or shade

Propagation Propagate by seed or softwood cuttings

Suggested planting locations and garden types Low Maintenance Cottage & Informal Garden

How to care

Pruning Pruning group 1

Pests Generally pest free

Diseases Generally disease free

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