How long does it take to grow a walnut tree from seed?
Written by
Liu Xiaohui
Reviewed by
Prof. Charles Hartman, Ph.D.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
