Walnut trees require time and patience, but the wait is worth it in the end. Seedlings typically take 8-12 years to produce nuts, but grafted saplings can cut that time down to 5-7 years. I had my first harvest in year seven; the muddy shoes and gnarled hands made it all worthwhile.
Soil Preparation
- Test soil pH (6.0-6.5) using a lab kit
- Amend clay soils with 30% coarse sand
- Apply 3 inches of compost before planting
Watering Schedule
- Young trees: 10-15 gallons weekly
- Mature trees: Deep soak every 2-3 weeks
- Avoid overhead watering to prevent fungal issues
Pest Control
- Apply spinosad sprays every 10 days in summer
- Install yellow sticky traps for husk flies
- Release ladybugs to combat aphid infestations
Husk flies create blackened nuts and stained shells. I lost one-third of my crop from 2021 by not spraying in mid-summer during a crucial flight period. Now I note on my calendar July 1st for all spinosad applications; the timing is non-negotiable for perfectly clean harvests.
Store walnuts in airtight containers and below 40°F to prevent them from spoiling and preserve their oils. If you have extra kernels, you can freeze them at 0°F, and you will be amazed how, even at five years old, they taste fresh. Light breaks down quality much sooner than heat. If storing in the pantry, I recommend using amber jars.
Read the full article: How to Grow Walnuts: 7 Essential Steps for Healthy Trees
