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Juglans regia

Juglans regia

Carpathian walnut, Persian walnut, Common walnut

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Description

Juglans regia (common walnut) is a deciduous tree, thought to be a native of Central Asia and later introduced from Asia to the American continent and Europe. The common walnut shares a long history with humankind: its significance is highlighted by the name regia, a reference to the king. Juglans regia can get 25-30 metres tall and wide with a rather whimsical, open, round crown, usually single-stemmed and can be long-lived.

The male flowers and green catkins appear in April and May before or along with the new red foliage. 1-3 nuts develop from the female flowers. The nuts ripen from the end of September into October when the green husks dry out, turn brown and split open. The nuts are usually spherical and vary in size and thickness of the shell. The green leaves are pinnate with elongated-lanceolate leaflets with smooth margins. Foliage and husks radiate a pleasant aroma. The autumn foliage is yellow-brown. The bark of younger specimens is light grey and smooth but older trees develop deeply grooved bark.

Juglans regia is a versatile tree for both dry and wet conditions. It tolerates brief bouts of seasonal flooding and many months of drought, albeit with some dying of the branches. The common walnut enjoys full sun and can be planted on virtually any soil. Due to the ultimate monumental crowns of mature trees, with almost horizontal heavy branches, it is only suited for large parks, gardens, estates and landscape settings where there is room. The fallen leaves contain allelochemicals to suppress competition from other plants, so it is only suitable for sites where underplanting is not required.

Types of planting

Tree types

standard trees half-stem trees multi-stemmed trees trees for climbing characteristic trees fruit trees woodland planting stock

Topiary on stem

fval vase fval multi-stem umbrella

Use

Location

park central reservation roof garden large garden traffic areas, industrial zones countryside ecological zone

Pavement

none none

Planting concepts

food forest landscape planting prairie planting

Characteristics

Crown shape

flattened spherical flattened spherical

Crown structure

semi-open semi-open open open

Height

20 - 30 m

Width

20 - 30 m

Winter hardiness zone

5B - 9B

Aspects

Wind

tolerant to wind

Soil

loess sabulous clay heavy clay light clay sand loamy soil

Nutrient level

moderately rich in nutrients rich in nutrients

Soil moisture level

dry moist

Light requirements

sun

pH range

acidic neutral alkaline

Host plant/forage plant

birds small mammals humans

Extreme environments

tolerates air pollution tolerant to short-term flooding

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Order this plant? Or would you like further information about Juglans regia? Make an appointment for a detailed planting recommendation.
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Photos

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high-stem standard tree
Juglans regia standard tree
high-stem standard tree
Juglans regia standard tree
high-stem standard tree
Juglans regia standard tree
high-stem standard tree
Juglans regia standard tree
high-stem standard tree
Juglans regia standard tree
multi-stem multi-stem
Juglans regia multi-stem
multi-stem multi-stem
Juglans regia multi-stem
multi-stem multi-stem
Juglans regia multi-stem
multi-stem multi-stem
Juglans regia multi-stem
multi-stem multi-stem
Juglans regia multi-stem
multi-stem multi-stem
Juglans regia multi-stem
flowers flowers
Juglans regia flowers
flowers flowers
Juglans regia flowers
flowers flowers
Juglans regia flowers
leaves leaves
Juglans regia leaves
leaves leaves
Juglans regia leaves
leaves leaves
Juglans regia leaves
leaves leaves
Juglans regia leaves
leaves leaves
Juglans regia leaves
leaves leaves
Juglans regia leaves
leaves leaves
Juglans regia leaves
leaves leaves
Juglans regia leaves
leaves leaves
Juglans regia leaves
fruits fruits
Juglans regia fruits
fruits fruits
Juglans regia fruits
fruits fruits
Juglans regia fruits
fruits fruits
Juglans regia fruits
fruits fruits
Juglans regia fruits
fruits fruits
Juglans regia fruits
fruits fruits
Juglans regia fruits
fruits fruits
Juglans regia fruits
fruits fruits
Juglans regia fruits
fruits fruits
Juglans regia fruits
autumn-leaves autumn leaves
Juglans regia autumn leaves
autumn-leaves autumn leaves
Juglans regia autumn leaves
bark bark
Juglans regia bark
bark bark
Juglans regia bark
bark bark
Juglans regia bark
bark bark
Juglans regia bark
bark bark
Juglans regia bark
twigs twigs
Juglans regia twigs
twigs twigs
Juglans regia twigs
twigs twigs
Juglans regia twigs
twigs twigs
Juglans regia twigs
twigs twigs
Juglans regia twigs
twigs twigs
Juglans regia twigs
twigs twigs
Juglans regia twigs
twigs twigs
Juglans regia twigs

Seasonal colours

Juglans regia seizoenskleur
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

Flowers

Flowers

catkins pendulous

Flower colour

green

Flowering period

April - May

Leaves

Leaf colour

buds orange-red matt green underside pale green

Leaves

deciduous ovoid big leathery scented pinnate composite

Autumn colour

yellow-brown

Fruits

Fruit colour

brown green

Fruits

striking edible large nut husk

Bark

Bark colour

pale grey

Bark

deeply furrowed smooth, later on rough

Twigs

Twig colour

brown pale grey

Twigs

bare horizontal branches long shoots

Root system

Root system

deep fine roots tap root

For and by green professionals

The TreeEbb is a platform for and by green professionals, in which we collect knowledge and experience from the sector and make this available for users. All the details and photos are free to use for non-commercial purposes. Want to share your tree knowledge? Send photographs and additional information to treeebb@ebben.nl

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Winter hardiness

A plant's winter hardiness is the coldest area in which it is frost-resistant. This is based on the average annual minimum temperature. Winter hardiness zones are thirteen different frost zones in steps of 5.5 degrees Celsius. This format is an international standard for the hardiness of plants. The zones in which the plant is frost-resistant are always included in the description of trees and other vegetation.

Winter hardiness is a genetic characteristic and is not influenced by the location in which the plant is cultivated. This means that a plant that has been cultivated for many years in winter-hardiness zone 6 but has a winter hardiness of 3 is perfectly suited for replanting in a colder zone. It will thrive there thanks to its genetic characteristics.

When choosing planting for a project, the winter hardiness of the plants is extremely important. By choosing species that match the zone in which the project is being created, it is possible to ensure that plants can withstand the minimum temperature in that area.

Winter hardiness map
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British Asssociation of Landscape Industries

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