Northern mountain ash (Sorbus decora)

Northern mountain ash

Also known as: Showy mountain-ash

The northern mountain ash is a shrub plant native to North America. It grows small, red fruits that resemble berries. Since the fruits remain in winter and spring, they are important food sources for birds. The northern mountain ash is sometimes grown as an ornamental plant.

Scientific classification

Species

Northern mountain ash (Sorbus decora)

Roses, elms, figs, and allies

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Perennial

Lifespan

Tree, Shrub

Plant Type

Spring, Early summer

Bloom Time

6 m to 9 m

Plant Height

5 m

Spread

Green, Blue, Yellow

Leaf Color

5 mm to 8 mm

Flower Size

White

Flower Color

Slow

Growth Rate

Images of Northern mountain ash

Attributes of Northern mountain ash

Growth Rate

The northern mountain ash grows slowly, most notably during summer and fall. This lethargic growth impacts leaf production, resulting in dense clusters of vibrant leaves that gradually unfurl. Some height increase may occur, but it is often imperceptible and can span several seasons. Its slow growth rate lends it resilience in harsh conditions, making it an enduring presence in its natural habitat.

Distribution of Northern mountain ash

Distribution Map

Northern mountain ash naturally graces the cooler climates of northern North America. It has also been introduced and cultivated in various temperate regions, becoming part of diverse horticultural landscapes beyond its original range. Despite its transplantation, northern mountain ash remains emblematic of the habitats where it evolved, spreading through both natural dispersal and human cultivation activities.

Native

Cultivated

Invasive

Introduced

No species reported

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Habitat

Woods, rocky slopes, shores

Care Guide for Northern mountain ash

Every 1-2 weeks

Water

Full sun

Sunlight

0 - 25 ℃

Ideal Temperature

Garden Soil

Soil Type

Water: Originating from cooler climates, northern mountain ash prefers consistent soil hydration without waterlogging. Watering every 1-2 weeks mimics its natural environment. As an outdoor plant, it thrives with seasonal moisture adjustments: less during dormancy and more during active growth cycles.

Fertilize: Fertilize northern mountain ash with balanced fertilizer (10-10-10) in early spring for growth and flowering. During growth, apply high-nitrogen fertilizer biannually. Avoid over-fertilization, adjust feeding as northern mountain ash matures, and use slow-release formulas for steady nutrients, ensuring even distribution around the base.

Pruning: Northern mountain ash features bright red fruit and vivid autumn leaves, thriving with early spring pruning. Begin by removing dead wood, then crossing branches to boost airflow. Thinning the crown aids light access and shape retention, enhancing berry yield and tree health. Use clean, sharp tools to avoid disease.

Propagation: Propagate northern mountain ash using cuttings from healthy semi-hardwood stems, ideally 15-20 cm (6-8 inches) long with several leaf nodes. Apply rooting hormone, then plant in well-draining soil, maintaining moisture and indirect sunlight until roots form, followed by transplanting for stronger growth.

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