• 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

Alnus incana 'Aurea'

grey alder 'Aurea'

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
grey alder 'Aurea'

© RHS

  • Other common names grey alder 'Aurea'

  • Family Betulaceae

  • Genus Alnus are vigorous deciduous trees and large shrubs with rounded leaves and often conspicuous catkins in winter

  • Details 'Aurea' is a large, conical, deciduous tree with yellow-green leaves. Conspicuous male catkins, to 10cm long, appear in spring. The smaller female catkins are followed by small, cone-like fruit that turn dark brown in autumn and persist into winter

Characteristics

  • Foliage Deciduous

  • Habit Bushy

  • 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

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

  • Exposure Exposed or Sheltered

Soil

  • Loam

    Loam

  • Chalk

    Chalk

  • Clay

    Clay

  • Sand

    Sand

  • MoistureMoist but well-drained, Poorly-drained, Well-drained

  • SoilLoam, Chalk, Clay, Sand

  • pHAcid, Alkaline, Neutral

Size

  • Ultimate height 8-12 metres

  • Ultimate spread 4-8 metres

  • Time to ultimate height 20-50 years

How to grow

Cultivation Able to thrive in poor, wet conditions but also tolerates dry soils

Propagation Propagate by hardwood cuttings

Suggested planting locations and garden types Hedging & Screens Low Maintenance

How to care

Pruning Pruning group 1

Pests May be affected by alder leaf beetle, alder sucker and leaf-mining sawflies

Diseases Susceptible to phytophthora root rot

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