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Fraxinus spaethiana - Ash

Fraxinus spaethiana
Ash

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More information

A species of ash tree native to China and Japan, almost absent in Europe, except for a few rare specimens found in Northern Europe. It forms a large tree with particularly ornamental, very bright green foliage. Its large and beautifully pinnate leaves provide a light and pleasant shade. It is a fairly hardy tree that enjoys sunny exposures and deep, fertile, wet to moist soils.
Height at maturity
24 m
Spread at maturity
16 m
Exposure
Sun, Partial shade
Hardiness
Hardy down to -23°C
Soil moisture
Dry soil, Moist soil
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Best planting time February, November
Recommended planting time January to March, October to December
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Flowering time April to May
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Description

Fraxinus spaethiana is a very rare species in cultivation, also known as Spaeth Ash, originating from China and Japan. It forms a large tree, with a few rare specimens found as street trees in England, Denmark, and Sweden. Few ashes have more beautiful foliage than this one. Its large, beautifully pinnate leaves provide light and pleasant shade during the summer. It is a fairly hardy tree that thrives in bright exposures and deep, moisture-retaining soils.

Fraxinus spaethiana, also known as Broad-leaved Ash, is a tree in the olive family, just like the olive tree and lilac. It is native to mountainous regions between 1200 and 2800 metres in China (Gansu, Guizhou, Hubei, Shaanxi, Sichuan, Yunnan) and Japan (Honshu, Shikoku, Kyushu), where it often dominates the riverside mountain forest habitat in which it is found. It forms a large tree that can reach 20 to 28 metres in height at maturity, with a straight trunk whose smooth bark is greenish-grey and darkens and cracks as it ages. The habit of this ash tree is initially pyramidal, rounding with age to become generally conical. It develops a vertical and fairly short, clear trunk topped with a round-shaped crown, quite closed when the tree is young, opening up with age. The deciduous leaves are arranged in pairs and measure 10 to 30 cm long with a petiole of 5 to 6 cm. They are composed of 7 to 11 sessile or nearly sessile, oblong to elliptical, slightly leathery leaflets. The edges are toothed and the leaves are veined. They are shiny and bright green with yellowish-green nuances at the beginning of summer. In autumn, they turn golden yellow for 3 to 5 weeks if not blown away by strong winds. They flower in spring, before the foliage appears, in the form of cream-white panicles. After pollination, they develop 2 to 4.5 cm long samaras.

The Spaeth Ash is a large tree, ideal for planting as a solitary specimen in a large garden or park, or as a street tree, where its foliage and elegant habit give it true ornamental qualities. It provides filtered shade, light and colour in front of dark hedges with other golden trees. Perfectly hardy and with limited requirements, it can tolerate any non-scorching exposure and adapts to any ordinary soil, including limestone, although its growth will be more significant in fertile, deep, and moist soil.

Plant habit

Height at maturity 24 m
Spread at maturity 16 m
Habit conical, pyramidal
Growth rate slow

Flowering

Flower colour green
Flowering time April to May
Inflorescence Panicle
Fruit colour green

Foliage

Foliage persistence Deciduous
Foliage colour green

Botanical data

Genus

Fraxinus

Species

spaethiana

Family

Oleaceae

Other common names

Ash

Botanical synonyms

Fraxinus platypoda

Origin

China

Product reference22056

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Planting and care

Plant your Fraxinus spaethiana in autumn or spring, in full sun or partial shade in all moist to wet soils, preferably fertile. If necessary, create a drainage pit with rocks if your soil is suffocating. If your soil is poor, adding leaf compost will be beneficial. Maintain regular watering during the summer following planting and ensure it is protected from prolonged droughts for another year, mulching can help retain moisture at the base and space out watering. It is important to keep in mind that this riverside tree requires consistently moist soil, at least at depth. It is hardy to -15ºC. Pruning involves balancing the habit of the tree every 3 years or so by opening up the centre of the canopy.

Planting period

Best planting time February, November
Recommended planting time January to March, October to December

Intended location

Suitable for Meadow, Woodland edge
Type of use Back of border, Free-standing
Hardiness Hardy down to -23°C (USDA zone 6a) Show map
Ease of cultivation Beginner
Planting density 1 per m2
Exposure Sun, Partial shade
Soil pH Any
Soil type Clayey (heavy), Clayey-chalky (heavy and alkaline), Silty-loamy (rich and light)
Soil moisture Dry soil, Moist soil, Deep, fertile.

Care

Pruning instructions Pruning is only necessary if the tree becomes too large for the space it has been allocated. If necessary, balance the tree's habit every 3 years or so by opening up the centre of the canopy and restricting crown development. Avoid severe cuts and limit pruning to smaller diameter branches whenever possible. Remove dead wood and broken branches for safety reasons, this can be easily done towards the end of spring when the leaves have emerged. Ash trees can be pruned throughout the year, except during periods of heavy frost, bud burst, and leaf fall.
Pruning Pruning recommended once a year
Pruning time January to March, June to August
Soil moisture Dry soil, Moist soil
Disease resistance Very good
Overwinter Can be left in the ground

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