Fraxinus americana 'Autumn Purple'

Autumn Purple White Ash

synonym Fraxinus americana 'Junginger'

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Description

Fraxinus americana ‘Autumn Purple’ (White ash ‘Autumn purple’, synonym Fraxinus americana ‘Junginger’) was introduced in 1956 by nurseryman Karl Junginger from Mc Kay nursery of Waterloo, USA. The tree grows quickly and as a juvenile forms a pyramidal crown with rounded top which later becomes a broadly oval round shape. Cultivar ‘Autumn Purple’ has denser branching than the species, with a more upright oval crown form, grows more slowly and - apart from cultivar ‘Autumn Applause’ - remains slightly smaller and narrower than the other cultivars. Fraxinus americana ‘Autumn Purple’ reaches a height of fifteen to eighteen metres, between ten and twelve metres wide and is considered as the most popular cultivar of Fraxinus americana.

The leaf of Fraxinus americana ‘Autumn Purple’ is bright green with a white-grey underside and has a coarse structure. The autumn colour - depending on site, amount of moisture and heat - changes every year and comes in a wonderful array of yellow, orange, red and violet shades. In April, ‘Autumn Purple’ bears inconspicuous catkins which change from green to dark violet; the selection is male and so no seeds are formed. Fraxinus americana ‘Autumn Purple’ has a deeply grooved and smooth, grey-brown bark and vertical, heavily branched, olive-green shoots.

Fraxinus americana ‘Autumn Purple’ grows best on moist, nutrient-rich, well-drained soils but adapts to most soils and levels of acidity and also tolerates drier soils. As a real light lover, the selection prefers a position in full sun. ‘Autumn Purple’ is especially attractive in open beds or green verges as a street or avenue tree and tends to branch out nicely for generous road lay-outs. In addition, the selection is magnificent in gardens and parks and - because it lacks seeds - is also ideally suited for parking areas. Fraxinus americana ‘Autumn Applause’ has so far shown little or no effect from ash dieback.

Types of planting

Tree types

standard trees multi-stemmed trees

Topiary on stem

multi-stem umbrella

Use

Location

street avenue car park / parking lot park large garden cemetery traffic areas, industrial zones countryside

Pavement

none

open

Characteristics

Crown shape

wide oval

pyramidal

Crown structure

semi-open

Height

15 - 18 m

Width

10 - 12 m

Winter hardiness zone

4A - 9B

Aspects

Wind

tolerant to wind

Soil

loess sabulous clay light clay sand loamy soil

Nutrient level

moderately rich in nutrients rich in nutrients

Soil moisture level

dry moist wet

Light requirements

sun partial shade

pH range

acidic neutral alkaline

Extreme environments

tolerant to salt spray

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Photos

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standard tree

multi-stem

leaves

autumn leaves

bark

twigs

Seasonal colours

Fraxinus americana 'Autumn Purple' seizoenskleur

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

Flowers

catkins discrete

Flower colour

dark violet green

Flowering period

April

Leaves

Leaf colour

bright green underside white-grey

Leaves

deciduous ovate underside hairy serrate pinnate composite

Autumn colour

yellow yellow-orange orange orange-red red-violet dark violet

Fruits

no fruit

Bark

Bark colour

grey-brown

Bark

deeply furrowed smooth

Twigs

Twig colour

olive green

Twigs

bare vertical branches thickly branched

Root system

deep shallow extensive 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.

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