East Asian alder (Alnus japonica)

East Asian alder

The tree height is 15 to 20 m and the diameter is about 60 cm. The male flower ears are a black-brown cylindrical shape that hangs down in a tail shape. The fruits are pine cones and ripen around fall. The leaves are patterned and oval with a length of 5 to 13 cm. There are fine saw blades on the edges.

Scientific classification

Species

East Asian alder (Alnus japonica)

Beeches, walnuts, and allied trees

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Perennial

Lifespan

2.5 m to 3.5 m

Spread

Green

Flower Color

Deciduous

Leaf type

5 - 32 ℃

Ideal Temperature

Spring

Growth Season

Images of East Asian alder

Distribution of East Asian alder

Distribution Map

East Asian alder, a tree species, is native to temperate regions of East Asia. It has extended beyond its natural range, now also found in parts of Southeast Asia. Cultivation of east Asian alder has occurred, suggesting its adaptive use in varied locales beyond its historical habitat.

Native

Cultivated

Invasive

Introduced

No species reported

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Habitat

Temperate forests, streambanks, roadsides

Quickly Identify East Asian alder

Distinctive ellipsoidal fruiting cones measuring 3/4 to 1 inch (1.9 to 2.5 cm) in length.

Male flowers in yellow-brown to red-brown catkins, 1 to 3 inches (2.5 to 7.5 cm) long.

Oval, narrow leaves with serrulate edges and acuminate tip, up to 5 inches (12.7 cm) long.

Female flowers on short purple-brown strobili, 0.39 to 0.79 inches (1 to 2 cm) long.

Canopy prefers full sun, resilient to pests, thrives in challenging conditions.

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Care Guide for East Asian alder

Every 2-3 weeks

Water

Full sun

Sunlight

5 - 32 ℃

Ideal Temperature

Potting Mix, Garden Soil

Soil Type

Water: Originating from moist regions, east Asian alder thrives in humid environments and shows moderate drought tolerance. Water every 2-3 weeks to keep the soil evenly damp. As a riparian plant, east Asian alder benefits from surrounding humidity and adapts well to seasonal water availability fluctuations.

Pruning: East Asian alder thrives with regular pruning, ideally in early spring. Remove dead or damaged branches to boost health and enhance air circulation. Shaping the plant encourages a strong structure, promoting vigorous growth and disease resistance while improving aesthetic appeal.

Propagation: East Asian alder thrives in moist soil and propagates well through cuttings of healthy semi-ripe wood. Use rooting hormone and a well-draining medium for planting. Maintain adequate moisture and warmth for root growth, avoiding waterlogging. Once rooted, transplant to a spacious final location.

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Common Pests & Diseases

Dark spots Yellow edges Leaf yellowing Leaf tip withering Dark blotch

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