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Juglans regia (F)

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© RHS 2002

Characteristics

Plant type

Tree

Habit

Spreading / Branched

Resilience

Hardiness

old H4 (hardy)

Colour

Flower

Green in Spring

Foliage

Dark Purple in Spring
Green in Autumn and Summer

Fruit

Green in Autumn

Size

Ultimate height

Higher than 12 metres

Ultimate spread

wider than 8 metres

Time to ultimate height

20-50 years


Preferred common name

common walnut

Family

Juglandaceae


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

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

Other common names

  • ban-nut tree
  • Black Sea walnut
  • English walnut
  • French nut
  • Madeira nut
  • Persian walnut
  • Welsh nut

Synonym(s)

  • Juglans sinensis

How to grow

Sunlight

  • Full sun

Aspect

  • North-facing, East-facing, South-facing or West-facing
  • Sheltered or Exposed

Cultivation

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

Soil

  • Well-drained or Moist but well-drained
  • Acid, Alkaline or Neutral
  • Chalk, Clay, Sand or Loam

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