Japanese tree clethra (Clethra barbinervis)

Japanese tree clethra

Also known as: Japanese clethra, White alder

The japanese tree clethra is a dense, deciduous shrub. It produces fragrant white flowers that are attractive to bees and butterflies. Its showy and fragrant blooms add value to gardens and can grow up to 2.5 m high. It has received the prestigious Royal Horticultural Society’s Award of Garden Merit.

Scientific classification

Species

Japanese tree clethra (Clethra barbinervis)

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Perennial

Lifespan

Shrub

Plant Type

Summer, Fall

Bloom Time

3 m

Plant Height

3 m to 4.5 m

Spread

Green, Red, Orange, Yellow

Leaf Color

2 mm to 3 mm

Flower Size

Brown, Copper

Fruit Color

White

Flower Color

Brown, Orange, Green, White

Stem Color

Images of Japanese tree clethra

Distribution of Japanese tree clethra

Distribution Map

Japanese tree clethra is naturally found in temperate regions of East Asia. This deciduous shrub or small tree has been successfully introduced and cultivated in various parts of the world beyond its native range. Its adaptability to different climates has allowed it to flourish in a variety of new environments, though the summary does not detail specific countries or areas of introduction.

Native

Cultivated

Invasive

Introduced

No species reported

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Habitat

Wooded hills, mountains, deciduous forests

Quickly Identify Japanese tree clethra

Fragrant white flowers in dense, drooping clusters from July to August.

Robust shrub with lustrous, serrated leaves transitioning to bronze-red in fall.

Dark brown seed capsules persist through winter, aiding in identification.

Polished trunk with exfoliating bark in rich brown to cinnamon hues.

Adaptable shrub growing up to 9 feet in height and width, tolerating partial shade.

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Care Guide for Japanese tree clethra

Every week

Water

Partial sun

Sunlight

0 - 38 ℃

Ideal Temperature

Garden Soil

Soil Type

Water: Japanese tree clethra thrives in moist woodlands, preferring consistent humidity. It is moderately drought-tolerant but performs best with evenly moist soil. Water weekly to maintain optimal hydration. As an outdoor plant in temperate regions, japanese tree clethra's growth is influenced by seasonal rainfall and dormancy cycles.

Fertilize: For japanese tree clethra, apply balanced fertilizers monthly during the growing season, tapering in fall. Follow product instructions to avoid overfertilization. Adjust for seasonal needs; reduce during winter dormancy. Monitor soil and foliage, and wear gloves while applying to optimize nutrient uptake.

Pruning: With fragrant white flowers and exfoliating bark, japanese tree clethra thrives with proper care. Prune in early spring to shape the plant, remove dead branches, and improve air circulation, promoting healthier growth and flowering. Use clean, sharp tools for precise cuts to maintain plant health.

Propagation: Japanese tree clethra can be propagated through semi-hardwood cuttings, which should have multiple leaf nodes for optimal root development. Using a rooting hormone and a well-draining medium, along with consistent moisture and warmth, enhances root establishment, leading to robust growth.

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