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Ulmus 'Regal'

Ulmus 'Regal'

'Regal' Elm

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Description

Ulmus ‘Regal’ (‘Regal’ elm) was selected from a sowing of elms of Dutch elm professor Hans Heybroek. The cross where this seed comes from arose in 1959 and included Ulmus ‘Commelin’, Ulmus pumila and Ulmus ‘Hoersholmiensis’. The seed was sown by American botanist Gene Smalley in Madison, United States, and he selected this clone in 1983 as one of his first introductions. Ulmus ‘Regal’ develops a broadly columnar habit with an open crown. It has pendulous branch tips, which creates a very ornamental appearance. ‘Regal’ becomes six to eight metres wide and sixteen to twenty-five metres tall.

The small, oval, glossy leaf emerges bright green in spring, turning dark green in the summer. At this time of year, the fine foliage and open crown allow sunlight to filter through to pleasant effect. In the autumn the foliage turns yellow. Ulmus ‘Regal’ produces inconspicuous, pale violet racemes in March. The seeds also hang together in racemes on short stems and are surrounded by samaras which produce the typical elm snow at the end of April.  ‘Regal’ has a grooved bark which reveals an orange underbark. 

Ulmus ‘Regal’ has poor resistance to Dutch elm disease sadly and can therefore only be used in areas with low infestation rates. It grows slowly with a loose habit - consequently the tree also benefits from some pruning. ‘Regal’ is a very good (coastal) wind resistant elm that makes it a great choice for coastal areas. Heat and drought are not an issue either: in tests in Eastern Arizona, USA, the tree is used in trials in the hottest climates and exhibits barely any leaf burn. Its distinct upright main trunk makes Ulmus ‘Regal’ a good option along streets and in avenues - in both urban and rural areas.

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

columnar columnar egg-shaped egg-shaped

Crown structure

semi-open semi-open

Height

16 - 25 m

Width

6 - 8 m

Winter hardiness zone

5A - 9B

Aspects

Wind

tolerant to wind tolerant to coastal wind

Soil

loess sabulous 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

Extreme environments

tolerant to salt spray tolerant to dryness tolerates air pollution tolerates heat resistant to dutch elm disease 3

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Order this plant? Or would you like further information about Ulmus 'Regal'? Make an appointment for a detailed planting recommendation.
Call +31(0) 485 31 20 21 or email one of our advisors directly.
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Photos

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high-stem standard tree
Ulmus 'Regal' standard tree
high-stem standard tree
Ulmus 'Regal' standard tree
high-stem standard tree
Ulmus 'Regal' standard tree
high-stem standard tree
Ulmus 'Regal' standard tree
high-stem standard tree
Ulmus 'Regal' standard tree
leaves leaves
Ulmus 'Regal' leaves
leaves leaves
Ulmus 'Regal' leaves
fruits fruits
Ulmus 'Regal' fruits
fruits fruits
Ulmus 'Regal' fruits
bark bark
Ulmus 'Regal' bark

Flowers

Flowers

raceme discrete

Flower colour

pale violet

Flowering period

March

Leaves

Leaf colour

dark green buds bright green

Leaves

deciduous ovoid dentate

Autumn colour

yellow

Fruits

Fruit colour

pale brown

Fruits

discrete winged nut

Bark

Bark colour

grey

Bark

furrowed slightly furrowed

Twigs

Twig colour

grey-brown

Twigs

bare vertical branches pendulous finely branched long shoots

Root system

Root system

deep highly branched

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 zone
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OK
Use
Location
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Planting concepts
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Types of planting
Tree types
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Multi-stemmed trees
OK
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m
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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
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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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