Position:
Choose a suitable site for planting black walnut trees. They prefer well-drained, fertile soils with a pH between 6.0 and 7.5. Avoid planting them in areas prone to flooding or with compacted soils.
Plant black walnut trees in spring after the danger of frost has passed.
Spacing:
Black walnut trees require ample space to grow. Plant them at least 10 to 15 metres apart for proper development.
Water:
Water regularly, especially during dry periods, for the first few years after planting.
Mulching:
Add a thick layer of pine bark mulch, keeping it about 20 to 30 centimetres away from the tree trunk (any closer may cause excess moisture and damage the trunk). This will retain the moisture in the soil and will prevent weeds from taking over.
Fertilising:
Apply 1 teaspoon of our slow-release nitrogen-rich berry fertiliser every 4-5 months.
Pest and Disease Management:
Aphids, citrus psylla, red scale, citrus greening. Spraying regularly with Agricultural Neem Oil or Effective Microorganisms (EM Control ) will assist in either prevention or after the fact. If you already have aphids or mites, wash the tree with a harsh hosing, and when dry, spray with Neem oil or EM Control.
Practice good garden hygiene (remove fallen fruit and leaves).
Watch for root rot (if overwatered) and fungal infections during wet periods.
Harvesting:
Black walnut trees typically start producing nuts after about 10 years, with full production occurring around 30 years of age. Harvest the nuts in Autumn after they have fallen to the ground.
Black walnut trees can provide valuable timber and nuts for a long time due to their long lifespan.
