Bruce Marlin / CC BY 3.0
garden
Walnut
Juglans
Edible
Edible PartsSeeds
Overview
A majestic, long-lived tree that produces one of the most nutritionally valuable nuts in the world. Walnuts are uniquely rich in ALA omega-3 fatty acids — the only tree nut with significant omega-3 content. The tree exudes juglone from its roots, a chemical that inhibits the growth of many other plants, so careful planning is needed when integrating walnuts into a food forest.
Growing Conditions
LightFull Sun
MoistureModerate
Hardiness Zones6 — 10
Height20m
Spread17.87m
Growth HabitTree
Pollinator Valuelow
Companion Planting & Soil
Good Companions
Avoid Planting Near
Soil pH6 — 7.5
Soil TypeDeep, well-drained, fertile, loamy soil
Planting Calendar
When to sow, transplant, and harvest by growing zone.
| Zone | Action | Months | Notes |
|---|---|---|---|
| Cold (1-2) | Transplant | Apr — May | Plant bare-root in spring; Carpathian walnut hardy to zone 4; needs 50+ foot spacing |
| Cold (1-2) | Harvest | Sep — Oct | Harvest when green hulls split and nuts fall; remove hulls and cure 2-4 weeks |
| Cold (1-2) | Prune | Aug — Sep | Prune in late summer to avoid bleeding; minimal pruning needed once established |
| Cool (3-4) | Transplant | Mar — Apr | Plant bare-root in spring while dormant; deep taproot — choose site permanently |
| Cool (3-4) | Harvest | Sep — Oct | Gather fallen nuts promptly; remove husks and dry |
| Cool (3-4) | Prune | Jul — Aug | Summer prune; avoid winter/spring — sap bleeds heavily |
| Moderate (5-7) | Transplant | Nov — Dec | Plant in late fall; English walnut (zone 5+) or black walnut (zone 4+) |
| Moderate (5-7) | Transplant | Feb — Mar | Spring planting alternative; first nuts in 5-7 years |
| Moderate (5-7) | Harvest | Sep — Nov | Harvest when hulls crack; cure in shade with good ventilation |
| Moderate (5-7) | Prune | Jul — Aug | Prune in summer only; remove dead and crossing branches |
| Warm (8-9) | Transplant | Nov — Dec | Plant during dormancy; needs 400-1500 chill hours by variety |
| Warm (8-9) | Harvest | Sep — Oct | Harvest when hulls split |
| Warm (8-9) | Prune | Jul — Aug | Summer prune; juglone from roots inhibits nearby plants |
| Hot (10+) | Transplant | Dec — Jan (wraps) | Plant in winter; choose low-chill varieties |
| Hot (10+) | Harvest | Aug — Oct | Harvest in late summer/early fall |
Uses
Culinary
- Eaten raw or toasted in baking, salads, and pestos
- Cold-pressed walnut oil for finishing dishes
- Green walnuts pickled or made into nocino liqueur
Medicinal
- Richest tree nut source of ALA omega-3 fatty acids
- Polyphenols support brain health and cognitive function
- Anti-inflammatory properties studied for cardiovascular benefits
Other Uses
- Prized hardwood for fine furniture and woodworking
- Hull used as a natural brown-black dye
- Juglone-aware planting design required
