Japanese Alder

Alnus japonica

Physical Characteristics

Alnus japonica is a deciduous Tree growing to 22 m (72ft 2in) at a fast rate. See above for USDA hardiness. It is hardy to UK zone 4. It is in flower from February to March. The species is monoecious (individual flowers are either male or female, but both sexes can be found on the same plant) and is pollinated by Wind. It can fix Nitrogen. Suitable for: medium (loamy) and heavy (clay) soils and can grow in heavy clay and nutritionally poor soils. Suitable pH: mildly acid, neutral and basic (mildly alkaline) soils. It can grow in semi-shade (light woodland) or no shade. It prefers dry moist or wet soil. The plant can tolerates strong winds but not maritime exposure.

Distribution

E. Asia - China, Japan.

Habitats

Woodland Garden Canopy; Bog Garden;

Edible Uses

None known

Medicinal Uses

Cancer Various species of alder, including this species, seem to contain antitumour compounds[218].

Known Hazards

None known