How, When and Why of Forest Farming Website

Japanese, Siebold

General
Common NameJapanese, Siebold
Latin NameJuglans ailantifolia
CategoryNuts 
FamilyWalnut 
Variety 
Visual Traits
Flowermonoecious, self-fertile, June
Fruit / Nutoval-shaped; thinner shell than North American walnuts; cracks poorly
Height20m
Spread15m
Cultivation
Pollinationwind pollinated
Propagation methodseed, container
Pruninglate summer to fall, during dormancy
Seed treatment and storagecold-stratification required, must protect from rodents if direct seeded or sown in cold frame (fall)
Seedling treatmentintolerant to root disturbance, plant in permanent location early, protect when young
Critters
PathogensWalnut bunch disease
Soils
Moisture and drainagerequires well-drained, moist
pHalkaline
Soils and topographymoist woodlands
Textureloam
Growth Pattern
Root habitdeep taproot
Seed-bearing age /max productionbear 3-4y from seed
Habitat and Climate
Hardiness Zoneto zone 4, hardier than J. ailantifolia var. cordiformis
Native RangeJapan
Wind / ice / frost susceptibilitysusceptible to frost damage, needs wind shelter
Light
Shade toleranceintolerant; canopy species