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Viburnum plicatum Shirogami®

Viburnum plicatum Shirogami®
Japanese Snowball, Japanese Snowball Bush

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A more compact Chinese viburnum, with a neat pyramidal habit and tiered branches. From May to early July, the bush produces flat, white umbels similar to lacecap hydrangeas. Flowering may recur in autumn depending on the year. This is followed by attractive, bright red berries that turn black. Its deciduous foliage takes on beautiful reddish-purple hues late in the season. Plant in a humus-bearing, moist but well-drained soil, in non-scorching sun or partial shade; hardiness around -25°C.
Height at maturity
1.40 m
Spread at maturity
90 cm
Exposure
Sun, Partial shade
Hardiness
Hardy down to -20.5°C
Soil moisture
Moist soil
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Best planting time March, October
Recommended planting time February to April, September to November
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Flowering time May to July
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Description

Viburnum plicatum or Chinese Viburnum Shirogami® is a deciduous bush with moderate growth, featuring a well-defined, pyramidal habit. Its large, flat, white inflorescences stand out against dark green, veined foliage; its flowering period extends from May to early July, sometimes followed by a light autumn flush. This less bulky and more floriferous variety is well-suited to gardens of modest size.

Viburnum plicatum belongs to the Adoxaceae family; the species is native to East Asia, found in Japan, China, Korea, and Taiwan. The forms with flat cymes, often associated with the former f. tomentosum, bear inflorescences positioned flat atop the branches. The cultivar marketed under the name Shirogami® is a selection distributed in Europe within the BEST-select range.
The shrub exhibits a naturally pyramidal habit with branches arranged in tiers, moderate growth, and final dimensions ranging from 1.30 to 1.50 m in height and 0.90 to 1 m in spread. The deciduous, ovate to elliptical, strongly veined foliage is dark green in season, then turns purplish-red in autumn; young leaves are sometimes slightly hairy on the underside. Flowering takes the form of flat, corymbiform cymes: on each, a collar of large, sterile white flowers surrounds a centre of small, fertile flowers, from May to early July. This variety may reflower in late summer, depending on conditions. The fruiting consists of red drupes turning black, loved by birds. This variety is hardy down to −25 °C.

This Shirogami viburnum will fit well in a large partially shaded border, near a path or terrace, where its flowering tiers can be seen in profile. Pair it with a red Japanese maple for its autumn foliage, with large rhododendrons or Chinese azaleas and then Hydrangea serrata to accompany its long flowering period. In a border formed of viburnums, combine cultivars with complementary habits and heights: ‘Mariesii’, ‘Summer Snow Flake’ or ‘Pink Beauty, all admired for their flat cymes and colourful autumn foliage.

In Japan, the form with flat cymes is known as yabu-demari; it was introduced to the West in the 19th century and works well in Japanese-inspired gardens due to its tiered branches.

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Viburnum, Viorne: planting, pruning and growing
Family sheet
by Alexandra 16 min.
Viburnum, Viorne: planting, pruning and growing
Read article

Viburnum plicatum Shirogami® in pictures

Viburnum plicatum Shirogami® (Flowering) Flowering

Plant habit

Height at maturity 1.40 m
Spread at maturity 90 cm
Habit conical, pyramidal
Growth rate slow

Flowering

Flower colour white
Flowering time May to July
Inflorescence Corymb, Cyme
Repeat-flowering Blooms several times a year
Flowering description Flowering may recur lightly in autumn, depending on the climate and growing conditions.
Fruit colour red

Foliage

Foliage persistence Deciduous
Foliage colour dark green

Botanical data

Genus

Viburnum

Species

plicatum

Cultivar

Shirogami®

Family

Adoxaceae

Other common names

Japanese Snowball, Japanese Snowball Bush

Origin

Cultivar or hybrid

Product reference25115

Planting and care

Plant Viburnum plicatum Shirogami from September to November or from February to April, in gentle sun or partial shade, sheltered from dry winds. Dig a hole twice as wide as the root ball, loosen the soil and mix in well-rotted compost and a little leaf mould; avoid chalky soils and waterlogging. Water generously after planting and then regularly during the first year, especially in hot weather, and mulch to retain moisture.
In the event of a dry summer, a deep, infrequent watering is better than frequent, shallow watering; in winter, the plant can withstand cold down to around −15 °C in well-drained soil.
To grow in a pot, choose a container 35–40 cm in diameter with drainage holes, a rich and light substrate, and water without leaving stagnant water in the saucer. Feed lightly in spring with a balanced organic fertiliser.
Pruning is optional: simply remove dead wood and shorten overly long shoots just after flowering to maintain the tiered habit.

Planting period

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

Intended location

Suitable for Meadow, Woodland edge
Type of use Border, Free-standing, Small gardens
Hardiness Hardy down to -20.5°C (USDA zone 6b) Show map
Ease of cultivation Amateur
Exposure Sun, Partial shade
Soil pH Acidic, Neutral
Soil type Clayey (heavy), Silty-loamy (rich and light)
Soil moisture Moist soil humus-bearing, well-drained

Care

Pruning No pruning necessary
Soil moisture Moist soil
Disease resistance Good
Overwinter Can be left in the ground

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