Styrax japonicus (Japanese Snowbell)


Michael's Opinion

The Japanese Snowbell is an accent plant. Suited in areas where it would be easily seen such as near a patio. Flowers are spectacular with a subtle fragrance. It may be short lived, but is well worth the effort in the culture. A class plant.

Botanical Information

FamilyStyracaceae
GenusStyrax
Speciesjaponicus
CategoryWoody
TypeTree (deciduous)
Pronunciation

Details

USDA Hardiness Zone5 to 8
USDA Hardiness Ref.
Canadian Hardiness Zone6 to 9
Canada Hardiness Ref.
RHS Hardiness Ref.
Temperature (°C)-26 - (-12)
Temperature (°F)-20 - 10
Height6.5 - 10 m
Spread6.6 - 10 m
GrowthMedium
Flowering PeriodMay

Description and Growing Information

General DescriptionA deciduous flowering tree with a single stem. It is an accent plant. A low branched tree with a somewhat rounded crown.
ID CharacteristicPendulous flowers below the foliage, smooth gray bark, naked buds, horizontal branching on older trees.
ShapeA low branched tree that develops a broad-rounded crown, branching is horizontal; single trunked.
PropagationSeeds exhibit a double dormancy and warm stratification for 5 months followed by cold for 3 months is recommended. Seeds could be autumn sown and germination will take place the second spring. If collected fresh and sown immediately they may come up the next spring. Softwood cuttings, treated with IBA will root. Styrax japonicus is extremely easy to root from softwood cuttings, about 1000 to 3000 ppm IBA quick dip, peat: perlite, mist proved optimum. The rooted cuttings are not easy to overwinter.
CultivationFull sun to partial shade, needs a moist, well drained, acidic soil, avoid difficult sites.
PestsLack of cold hardiness can be a problem in the colder parts of its useful range. Bark splitting and ambrosia beetle can be problems. It is a delicate plant that can thrive for several years and die abruptly.
Notable SpecimensThe Niagara Parks Botanical Gardens, Niagara Falls, Ontario.
HabitatNative to China, Japan and Korea.
Bark/Stem DescriptionBark is gray brown with smooth consistency but showing irregular, orangeish brown, and interlacing fissured and an excellent addition to the winter landscape.
Flower/Leaf Bud DescriptionSmall, sessile, naked, scurfy, superposed, 5 mm long
Leaf DescriptionSimple leaves in an alternate arrangement, ovate to elliptic, acute to acuminate, 2.5-8 cm long and 1-3.5 cm wide. Medium to dark green and often lustrous above, glabrous, with auxiliary tufts below.
Flower DescriptionFlowers May/June. White blooms hang below the foliage and are 5-lobed with yellow stamens. They are slightly fragrant, bell shaped, corolla 5 lobed being united near base, 2cm wide.
Fruit DescriptionDry rounded drupes, ovoid, about 1 cm long, grayish in colour, and somewhat attractive, ripe in August and often falling by November, containing a single shiny brown hard seed.
Colour DescriptionSummer colour is dark lustrous green. Autumn colour is yellow, often with a reddish cast, can be reasonably showy, but colours up late. Autumn foliage is often frozen before full colour develops.
Texture DescriptionMedium-fine

Photographs