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Ulmus 'Wanoux'

Ulmus 'Wanoux'

'Wanoux' Elm

synonym Ulmus VADA®

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Description

Ulmus ‘Wanoux’ (‘Wanoux’ elm, synonym trade name Ulmus ‘VADA’) like Ulmus ‘Nanguen’ (also known as ‘LUTÈCE’) was sown and crossed in 1967 by Dutch elm professor Hans Heybroek. The tree was not released after his retirement but from 1980 onwards it was tested by the INRA research institute in France and released in 2006 by research scientist Jean Pinon. The seedling arose via a self-pollinated Ulmus ‘Plantijn’. The name of this selection is a contraction of two research locations: Wa-geningen and Champe-noux, and the trade name ‘VADA’ is the Roman name for Wageningen. ‘Wanoux’ is a strongly upright, broadly pyramidal and asymmetrical tree and a fairly fast grower with an enclosed crown which eventually assumes a fairly open habit. The selection grows ten to fourteen metres tall and has a reasonably upright main trunk. Ulmus ‘Wanoux’ stays narrower than Ulmus ‘Nanguen’ and ultimately gets four to five metres wide.

The dark green leaf of Ulmus ‘Wanoux’ is round, twisted and glossy. The foliage stays smaller than that of cultivar ‘Nanguen’ but is earlier to bud. Not all leaf buds sprout and this can create a balder look. ‘Wanoux’ has wonderful brown-yellow autumn colour. Before the foliage emerges - around March and April - the tree produces yellow-green clusters of flowers close against the branches which are followed by egg-shaped, winged nutlets. The branches are brown-green and evenly distributed, fairly coarse and grow horizontally before turning upwards. The wood is very strong. 

Ulmus ‘Wanoux’ exhibits strong resistance to Dutch elm disease and makes a suitable street tree that tolerates drought, wind and coastal wind and is quite resistant to wet sites. The selection thrives well in paved surfaces and is tolerant of road salt but poor soils should be avoided. In rural areas too and in parks it is a lovely, robust elm with a characteristic, somewhat untidy growth habit. Regarding this growth habit, the juvenile Ulmus ‘Wanoux’ has yet to prove itself.

Types of planting

Tree types

standard trees

Use

Location

street avenue square car park / parking lot park central reservation large garden cemetery traffic areas, industrial zones countryside windbreak coastal area

Pavement

none none open open sealed sealed

Planting concepts

landscape planting solid planting

Characteristics

Crown shape

wide pyramidal wide pyramidal

Crown structure

open open

Height

10 - 12 m

Width

4 - 5 m

Winter hardiness zone

5A - 8B

Aspects

Wind

tolerant to wind tolerant to coastal wind

Soil

loess sabulous clay peaty heavy clay light clay sand loamy soil all soils

Nutrient level

moderately rich in nutrients rich in nutrients

Soil moisture level

dry moist

Light requirements

sun partial shade

pH range

acidic neutral alkaline

Host plant/forage plant

butterflies

Extreme environments

tolerant to salt spray tolerant to dryness tolerates air pollution resistant to dutch elm disease 5

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Photos

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high-stem standard tree
Ulmus 'Wanoux' standard tree
high-stem standard tree
Ulmus 'Wanoux' standard tree
high-stem standard tree
Ulmus 'Wanoux' standard tree
high-stem standard tree
Ulmus 'Wanoux' standard tree
high-stem standard tree
Ulmus 'Wanoux' standard tree
high-stem standard tree
Ulmus 'Wanoux' standard tree
leaves leaves
Ulmus 'Wanoux' leaves
leaves leaves
Ulmus 'Wanoux' leaves
leaves leaves
Ulmus 'Wanoux' leaves
leaves leaves
Ulmus 'Wanoux' leaves
leaves leaves
Ulmus 'Wanoux' leaves
leaves leaves
Ulmus 'Wanoux' leaves
leaves leaves
Ulmus 'Wanoux' leaves
leaves leaves
Ulmus 'Wanoux' leaves
leaves leaves
Ulmus 'Wanoux' leaves
fruits fruits
Ulmus 'Wanoux' fruits
bark bark
Ulmus 'Wanoux' bark
twigs twigs
Ulmus 'Wanoux' twigs
twigs twigs
Ulmus 'Wanoux' twigs
twigs twigs
Ulmus 'Wanoux' twigs
twigs twigs
Ulmus 'Wanoux' twigs

Flowers

Flowers

raceme striking

Flower colour

yellow-green

Flowering period

March - April

Leaves

Leaf colour

dark green

Leaves

deciduous orbicular small polished serrate undulate

Autumn colour

yellow-brown

Fruits

Fruit colour

green

Fruits

striking winged small nut

Bark

Bark colour

grey-brown

Bark

smooth

Twigs

Twig colour

brown-green

Twigs

bare horizontal branches thickly branched

Root system

Root system

shallow highly branched on own 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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Location
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OK
Planting concepts
OK
Types of planting
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OK
Multi-stemmed trees
OK
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OK
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Topiary on stem
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m
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m
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Width
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m
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Aspects
Wind
OK
Soil
OK
Nutrient level
OK
Soil moisture level
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Light requirements
OK
PH range
OK
Extreme environments
OK
Stage of succession
OK
Plant characteristics
Flowering period
January
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December
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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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