University of Florida

Juglans ailantifolia

Common name(s): Siebold Walnut, Japanese Walnut

Plant type: deciduous medium tree
Primary method of propagation: seed
Alternate propagation method(s): cutting, layering, grafting/budding

Propagation by Cuttings

Cutting type: stem tip
Time of year to take cuttings: Winter
Cutting maturity: softwood, hardwood
Rooting hormone: IBA TALC 8000 PPM
Rooting environment: intermittent mist
Soil temperature for best rooting: 75 degrees F
Time to rooting: 6-8 weeks
Comment: Wound cutting

Propagation by Seed

Time of year to collect seed: Autumn
Time of year to sow seed: Summer
Seed treatment: none
Preferred temperature for germination: 70-85 degrees F
Time required for germination: 4-6 weeks
Comment: Seeds could be planted in Fall. Fumigate and mulch seedbeds and use screen wires against rodents.

Propagation by Layering

Type of Layering: air, trench
Time of year to layer: late Winter
Wounding: remove a ring of bark
Comment: Orchard plantable stocks are produced in two years after girdling etiolated shoots.

Propagation by Grafting

Time of year to graft: Summer
Type of graft: whip, 'T'
Comment: Seedlings are cut off 10-14 days before grafting for the sap to flow and dry-up. When the grafter begin grafting seedlings are cut 1-2 inches just enough to remove the dry surface.