Japanese alder

Alnus matsumurae

Growth Characteristics of Japanese Alder (Alnus matsumurae):

Japanese alder is a deciduous tree that grows primarily in temperate and boreal climates of the Northern Hemisphere. It grows rapidly and can reach a height of approximately 20 meters. It thrives even in acidic soils and particularly prefers regions with high rainfall. This tree has the ability to fix nitrogen through symbiotic root nodule bacteria, allowing it to grow well even in poor soil.

Propagation Methods:

Japanese alder is primarily propagated by seeds. Collecting seeds from mature fruits in the autumn and planting them in early spring allows for effective germination. It can also be propagated by division or grafting, although these methods are generally not commonly used.

Cultivation Methods:

This tree thrives in sunny locations and is best suited for well-drained soil. It grows well in well-drained soil, and it is important to provide sufficient water during the initial period after planting. Mature trees can generally grow without additional watering. Use in Gardens:

Japanese alder possesses excellent landscape value and, due to its rapid growth, provides abundant shade in gardens and parks. It is popular for landscaping and is well utilized in waterside gardens in humid areas.

Key Pests and Control Methods:

Although Japanese alder is relatively resistant to diseases, it may be susceptible to various pests that damage the woody tissue or aphids that damage the leaves. Generally, proper pruning and hygiene management are important for control, and appropriate insecticides can be used in severe cases. Additionally, managing the environmental conditions of the planting area to minimize stress helps prevent pests and diseases.

Plant Type
Plant Family	Betula family
Height	10~15m
Spread
Colors	yellow, green
Bloom Period	April~May
Water Needs	commonly
Exposure	semi-shaded area
Freezing Resistance	-30°C

hairy alder
Alnus × mayrii

Bush alder
Alnus alnobetula subsp. fruticosa