Juglans regia (F) | common walnut

Other common names

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

Synonyms

Juglans sinensis

Trees

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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

Position

Full sun

Soil Types

Chalk, Clay, Loam, Sand

Max Height

Higher than 12 metres

Max Spread

wider than 8 metres

Size

Time to Maturity: 20–50 years
Max Spread: wider than 8 metres
Max Height: Higher than 12 metres

Growing Conditions

Chalk Clay Loam Sand

Moisture: Moist but well–drained or Well–drained
pH: Acid or Alkaline or Neutral

Position

Full sun

Aspect: East–facing or South–facing or North–facing or West–facing
Exposure: Exposed or Sheltered
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): H6

Colour & Scent

Season	Stem	Flower	Foliage	Fruit
Spring
Summer
Autumn
Winter

Botanical Details

Family: Juglandaceae
Native to GB/Ireland: No
Foliage: Deciduous
Habit: Spreading branched
Genus: Juglans are deciduous trees with pinnate leaves, and inconspicuous flowers in catkins followed by usually edible nuts
Name Status: Correct
Horticultural Group

Horticultural Classification Codes

Horticultural Classification Codes are often given to genera which have a large number of species or cultivars. They are used to categorise cultivated plants based on specific, shared characteristics such as shape, colour, size or flowering time, and can be displayed as letters or numbers

For example:
Dahlia ‘Sunset Kate (Sin) = Single flower
Rosa ‘Marigold’ (HT) = Hybrid Tea: Produces walnuts
Plant Range: Europe to C Asia

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

Pruning

Pruning group 1

Pests

May be susceptible to aphids and walnut blister mite

Diseases

May be susceptible to walnut leaf spot, walnut leaf blotch, honey fungus and coral spot