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Distylium racemosum

Distylium racemosum
Isu Tree

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More information

Beautiful rare, elegant, original and highly ornamental bush, forming a dense, spreading and wide habit. Its arching stems bear dense, dark green evergreen leaves and are covered in spring with dark red flower spikes without petals. It will undoubtedly bring an oriental and Japanese touch to the garden!
Flower size
4 cm
Height at maturity
3 m
Spread at maturity
3 m
Exposure
Partial shade
Hardiness
Hardy down to -15°C
Soil moisture
Moist soil
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Best planting time March to April
Recommended planting time February to April, September to November
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Flowering time April to June
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Description

Distylium racemosum is a beautiful, rare, elegant, original and very ornamental bush, forming a dense, spreading and wide habit. Its arching stems bear dense, evergreen, dark green leaves, and are covered in spring with petal-less, dark red flowers. It will bring an oriental and Japanese touch to the garden!

 

Belonging to the Hamamelidaceae family, it originates from the woods of Eastern and Southeast Asia. It forms a beautiful dense bush, with a wide and spreading habit, measuring 2 to 3 m (6 ft 7 in to 9 ft 10 in) in all directions, with a slow growth rate. It displays arching branches, adorned with shiny, persistent foliage, consisting of 3 to 7 cm (1.2 to 2.8 in) long, leathery, dark green leaves. In spring, it is adorned with small, slightly fragrant flowers, measuring 3 to 5 cm (1.2 to 2 in), grouped in erect clusters, devoid of petals but presenting purple stamens and well-defined dark red calyxes. Following this, capsule-shaped fruits appear.

 

In its natural habitat, Distylium racemosum can reach a height of 25 m (82 ft). Its hard, fine-grained wood is used in Asia as a precious wood, for the production of musical instruments, handicrafts and furniture.

The moderately hardy Distylium racemosum should be planted in a sheltered location in the garden, in partial shade and in fertile and moist, well-drained soil. It can be planted in a shrub bed or as a standalone specimen, at the edge of a bed, or inserted into a hedge. With its spreading habit, dense vegetation, dark green persistent foliage and unique purple flowering, it will undoubtedly bring a beautiful oriental touch to the garden. For a Japanese garden atmosphere, it can be associated with Chinese Azalea, Japanese Andromeda, Mountain Laurel, Japanese Quince or even Korean Forsythia.

Distylium racemosum in pictures

Distylium racemosum (Flowering) Flowering
Distylium racemosum (Foliage) Foliage

Plant habit

Height at maturity 3 m
Spread at maturity 3 m
Habit Irregular, bushy
Growth rate slow

Flowering

Flower colour insignificant
Flowering time April to June
Inflorescence Cluster, Spike
Fragrance slightly scented
Fruit colour black

Foliage

Foliage persistence Evergreen
Foliage colour dark green

Botanical data

Genus

Distylium

Species

racemosum

Family

Hamamelidaceae

Other common names

Isu Tree

Origin

Southeast Asia

Product reference827331

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Planting and care

Distylium racemosum is a low-maintenance, easy-to-grow bush that is disease-free. Moderately hardy and able to withstand light frosts down to approximately -5°C (23 °F) to -7°C (19.4 °F), it should be planted in partial shade and protected from cold, drying winds, in a cool, humus-rich, fertile, neutral to acidic, well-drained soil. It prefers consistently moist soil but does not tolerate waterlogging. Young plants should be protected from late frosts during the first few years by applying a thick layer of mulch around their base. Even if its young shoots have been damaged by frost, the Distylium racemosum is not significantly affected.

Planting period

Best planting time March to April
Recommended planting time February to April, September to November

Intended location

Suitable for Meadow, Woodland edge, Undergrowth
Type of use Border, Free-standing
Hardiness Hardy down to -15°C (USDA zone 7b) Show map
Ease of cultivation Amateur
Planting density 1 per m2
Exposure Partial shade
Soil pH Acidic, Neutral
Soil type Silty-loamy (rich and light)
Soil moisture Moist soil, Well-drained

Care

Pruning instructions Every 3 to 4 years in February-March when the plant is dormant, remove unruly or tangled stems if necessary to maintain a beautiful framework.
Pruning Pruning recommended once a year
Pruning time February to March
Soil moisture Moist soil
Disease resistance Very good
Overwinter Can be left in the ground

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