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Alnus japonica

Common Name(s):

Phonetic Spelling
AL-nus juh-PON-ih-kuh
Description

Tough, adaptable plant; few pest problems; tolerates short-term flooding; flower and fruiting best in full sun. Uncommon in the U.S. Good selection for difficult sites such as moist low spots or dry sites with poor soils. Woodland areas.  Does not perform well south of zone 7.

Insects, Diseases, and Other Plant Problems: No serious problems.

See this plant in the following landscape:
Cultivars / Varieties:
Tags:
#deciduous#shade tree#conical#moist soil#adaptable#pryamidal#wet soils tolerant#dry soils tolerant#spotted leaves#woodland
 
Bark
Bark Σ64 CC BY-SA 3.0
Form
Form KENPEI CC BY-SA 3.0
Leaves and cones
Leaves and cones KENPEI CC BY-SA 3.0
Trees
Trees Σ64 CC BY 2.0
Leaf
Leaf Σ64 CC BY-SA 3.0
Bark close up
Bark close up Kenpei CC BY-SA 3.0
Cultivars / Varieties:
Tags:
#deciduous#shade tree#conical#moist soil#adaptable#pryamidal#wet soils tolerant#dry soils tolerant#spotted leaves#woodland
  • Attributes:
    Genus:
    Alnus
    Species:
    japonica
    Family:
    Betulaceae
    Life Cycle:
    Woody
    Country Or Region Of Origin:
    Japan, Korea, Manchuria
    Dimensions:
    Height: 12 ft. 0 in. - 25 ft. 0 in.
    Width: 8 ft. 0 in. - 12 ft. 0 in.
  • Whole Plant Traits:
    Plant Type:
    Tree
    Woody Plant Leaf Characteristics:
    Deciduous
    Habit/Form:
    Pyramidal
    Maintenance:
    Low
    Texture:
    Medium
  • Cultural Conditions:
    Light:
    Full sun (6 or more hours of direct sunlight a day)
    Partial Shade (Direct sunlight only part of the day, 2-6 hours)
    Soil Drainage:
    Frequent Standing Water
    Available Space To Plant:
    6-feet-12 feet
    12-24 feet
    USDA Plant Hardiness Zone:
    5a, 5b, 6a, 6b, 7a, 7b
  • Fruit:
    Fruit Type:
    Nut
    Fruit Length:
    < 1 inch
    Fruit Description:
    ellipsoidal fruiting cones 3/4"-1" long
  • Flowers:
    Flower Color:
    Brown/Copper
    Gold/Yellow
    Insignificant
    Purple/Lavender
    Flower Inflorescence:
    Catkin
    Flower Bloom Time:
    Spring
    Flower Description:
    Monecious blooms appear in March yellow-brown to red-brown catkins (male flowers) appear in clusters, female flowers on short, purplish-brown strobili which persist until winter
  • Leaves:
    Woody Plant Leaf Characteristics:
    Deciduous
    Leaf Color:
    Green
    Leaf Shape:
    Elliptical
    Ovate
    Leaf Margin:
    Serrate
    Hairs Present:
    No
    Leaf Length:
    3-6 inches
    Leaf Description:
    Oval, narrow leaves acuminate, serrulate, dark green leaves (to 5" long). Wedge-shaped at the base and light green underneath. Fall color unremarkable.
  • Stem:
    Stem Is Aromatic:
    No
  • Landscape:
    Landscape Location:
    Slope/Bank
    Woodland
    Design Feature:
    Shade Tree
    Resistance To Challenges:
    Dry Soil
    Insect Pests
    Poor Soil
    Wet Soil