• 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

Juglans regia (F)

common walnut

  • Other common names common walnut
    ban-nut tree

    Black Sea walnut
    English walnut
    French nut
    Madeira nut
    Persian walnut
    Welsh nut

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  • Synonyms Juglans sinensis

  • Family Juglandaceae

  • Genus Juglans are deciduous trees with pinnate leaves, and inconspicuous flowers in catkins followed by usually edible nuts

  • Details J. regia is a medium-sized, broad-crowned deciduous tree. Leaves with 5-7 large oblong leaflets, aromatic when bruised. Male catkins to 10cm in length; fruits green, globose, 5cm in width, with edible kernel

  • Plant range Europe to C Asia

Characteristics

  • Foliage Deciduous

  • Habit Spreading / Branched

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

  • Exposure Sheltered or Exposed

Soil

  • Chalk

    Chalk

  • Chalk

    Clay

  • Chalk

    Sand

  • Chalk

    Loam

  • MoistureWell-drained, Moist but well-drained

  • SoilChalk, Clay, Sand, Loam

  • pHAcid, Alkaline, Neutral

Size

  • Ultimate height Higher than 12 metres

  • Ultimate spread wider than 8 metres

  • Time to ultimate height 20-50 years

How to grow

Cultivation Grow as a specimen tree in any well-drained or moist but well-drained soil in full sun

Propagation Propagate by seed or grafting

Suggested planting locations and garden types Low Maintenance

How to care

Pruning Pruning group 1

Pests Aphids and walnut blister mites may be a problem

Diseases Coral spot and a leaf spot may be a problem

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