Growing Walnut in Australia: The Complete Guide
Walnut is a moderate nut tree to grow, needing full sun with regular while establishing, moderate once mature watering.
Walnut is one of the moderate additions to a home garden, and this article walks through everything behind our one-page printable guide in a bit more depth.
Nut anatomy
Walnuts grow inside a green husk that splits and blackens as it ripens, revealing the familiar hard-shelled nut — and mature trees need serious space, so plan for a large mature canopy.
How to Plant Walnut
Method — plant from a potted or bare-root tree; taproot dislikes disturbance so plant young. Soil — deep, well-drained, fertile. Timing — plant in winter while dormant.
Ongoing Care
The key things to get right:
- Give it room — walnuts grow into very large trees.
- Water regularly while establishing.
- Avoid planting other crops too close — walnut roots produce a natural chemical that suppresses some nearby plants.
- Prune minimally once established; mainly to remove damaged wood.
Common Problems
A few things matter most here:
- Walnut blight — dark blotches on husks and leaves in wet weather; improve airflow.
- Codling moth — can affect developing nuts; monitor.
- Allelopathy affecting nearby plants — avoid planting sensitive species (tomato, apple) within the drip line.
- Slow to bear — patience is needed; grafted trees fruit sooner than seedlings.
Picking and Keeping Your Harvest
Signs — husks split and begin to blacken, typically autumn. Method — collect fallen nuts promptly, or knock from the tree once husks split. Curing — remove husks, then dry nuts in shell 2–3 weeks in a warm, airy spot. Storage — shelled kernels keep months airtight in a cool spot, longer frozen.
That's the full picture behind walnut. The printable A4 version of this guide — with the quick-reference gauges and diagram in one page — is available on the main guide page below.