Korean mountain ash (Sorbus alnifolia)

Korean mountain ash

Also known as: Hornbeam-ash, Mountain ash

Because of its autumn color, the korean mountain ash is sometimes grown as an ornamental tree in northern Europe. This flowering tree is pyramid shaped at first but eventually grows into a rounder shape. It has red to yellow fruits that attract and feed birds.

Scientific classification

Species

Korean mountain ash (Sorbus alnifolia)

Roses, elms, figs, and allies

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Perennial

Lifespan

Tree

Plant Type

Spring, Summer

Bloom Time

10 m to 20 m

Plant Height

6 m to 8 m

Spread

Green, Yellow

Leaf Color

1 cm to 1.8 cm

Flower Size

0 - 32 ℃

Ideal Temperature

Summer

Growth Season

Rapid

Growth Rate

Images of Korean mountain ash

Distribution of Korean mountain ash

Distribution Map

Korean mountain ash is a plant naturally found in East Asia, growing in various territories across the continent. It has spread beyond its native range, being introduced to regions in Europe, especially notable in the temperate zones. Korean mountain ash has also been adopted into cultivation, signifying its ability to adapt and be nurtured beyond its original habitat.

Native

Cultivated

Invasive

Introduced

No species reported

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Quickly Identify Korean mountain ash

Dense flattened corymbs with small white 5-petaled flowers (3 inches/7.6 cm across).

Berry-like pomes with pink to deep scarlet color gradient (5/8 inch/1.6 cm long).

Smooth dark green oval leaves (2-4 inches/5-10 cm) with fine-toothed margin.

Transformative structure from pyramid to rounded tree with smooth gray bark resembling beech texture.

Ornamental white flowers in May, persisting pomes after foliage fall for winter interest.

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Care Guide for Korean mountain ash

Every 2 weeks

Water

Full sun

Sunlight

0 - 32 ℃

Ideal Temperature

Garden Soil

Soil Type

Water: Korean mountain ash is adapted to temperate regions, demonstrating moderate drought tolerance and a preference for well-drained soil. It requires watering every two weeks and is well-suited for outdoor cultivation, thriving in diverse climate zones with varying rainfall patterns.

Fertilize: For korean mountain ash, apply balanced fertilizers in early spring every 4-6 weeks during growth. Reduce application in fall. Avoid over-fertilization to prevent root damage; follow guidelines. Incorporate fertilizer into moist soil for optimal absorption and seasonal nutrient adjustment.

Pruning: Korean mountain ash has oval leaves and white flowers that become red berries. Prune in early spring by removing dead or diseased branches and thinning for better air circulation. This promotes healthy growth and abundant blooms. Always use clean, sharp tools to minimize damage and disease risk.

Propagation: Korean mountain ash, native to cool mountain forests, is a hardy ornamental plant. To propagate, use fresh seeds and scarify them to aid germination. Sow in well-draining soil, maintain consistent moisture, and acclimate seedlings gradually before transplanting.

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