Northern ash: complete guide

Northern ash (Fraxinus bungeana), belonging to the Oleaceae family, is an attractive tree native to central and southeastern China and Manchuria. Reaching 10-15 meters at maturity, this ornamental tree is prized for its elegant compound foliage and impressive autumn fruit display, making it a valuable choice for gardens seeking visual reward across multiple seasons.

The foliage is compound, meaning each leaf consists of numerous small leaflets arranged along a central stem. During the growing season, the leaves are bright green and soft to the touch. As autumn approaches, the foliage transforms to warm golden-yellow and red tones, creating a spectacular display against blue autumn skies. This autumn colour persists for several weeks before leaf drop.

Flowers emerge in early spring before or concurrent with bud break. They are small and inconspicuous, but the resulting fruit production is remarkable. The fruits, called samaras or winged seeds, are 3-4 cm long and appear in large clusters. Each seed bears a papery wing that aids wind dispersal. The fruit display remains on the tree into late autumn and winter, providing additional ornamental value throughout the season.

Northern ash thrives in well-drained soil with moderate fertility. This tree dislikes waterlogging or waterlogged conditions and performs best in neutral to slightly acidic soil. Position the tree in full sun, requiring at least 6-8 hours of direct light. The tree tolerates urban air pollution well, making it suitable for street plantings and parks.

Watering is important during the establishment period following planting. Provide deep watering every two weeks during the first year to establish a strong root system. Once established, the tree is quite drought-tolerant and normal rainfall usually provides sufficient moisture.

Pruning can be performed in late winter or early spring to maintain form. Remove crossing branches, dead wood, and inward-growing shoots. This tree naturally forms a neat, rounded crown without heavy intervention.

Hardiness: Northern ash is hardy to USDA zone 5, tolerating minimum temperatures to -29 Celsius. This makes it suitable for the Netherlands, Belgium, northern France, and Germany. The tree grows at a moderate rate, reaching full maturity over 20-30 years. It typically lives 100+ years, making it a good long-term investment.

This tree is valuable as a specimen in large gardens or as a street tree along avenues. It also works well in groups of three or more for dramatic effect. Companion plantings can include shade-tolerant understorey plants such as hostas, astilbes, and shade-loving groundcovers.

Availability: Fraxinus bungeana is less common in Dutch and Belgian nurseries. Intratuin and Gamma can order it through specialist suppliers, though stock varies. German retailers OBI and Hornbach occasionally source Chinese tree species. In France, inquire at Truffaut or Jardiland. Gardenworld.app can help you locate this elegant Asian tree and integrate it optimally into your garden design.