202. Juglans nigra

Common name(s): Black Walnut, American Walnut, Eastern Black Walnut

Plant type: deciduous large 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 cuttings.

Propagation by Seed

Time of year to collect seed: autumn
Time of year to sow seed: spring
Seed treatment : stratify 40F 4-5mo.
Preferred temperature for germination : 70-85 degrees F
Time required for germination : 4-6 weeks
Comment: Fumigate and mulch seed beds. 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

Type of graft: whip, 'T'
Stock: rootstock: J. Hindsii or Paradox Hybrids
Comment: The best time for grafting/budding for whip is Spring and for 'T' is Autumn. Seedlings are cut off 10-14 days before grafting for the sap to dry. When the grafter begins seedlings are cut 1-2 inches to remove the dry surface.