Black Walnut — Growing reference
| Scientific name | Juglans nigra |
|---|---|
| First harvest or flowering (days) | 2555–4380 |
| Measured from | Transplant |
| Plant spacing (cm) | 1219.2–1828.8 |
| Mature height (cm) | 1219.2–2438.4 |
| Mature spread (cm) | 914.4–1828.8 |
| USDA hardiness zones | 4–9 |
| Light | Full sun |
| Water | Moderate |
| Sowing method | Transplant |
Growing directions
Black walnut is a native North American species grown primarily for its richly flavored nuts and valuable timber. It produces high concentrations of juglone in its roots, leaves, and hulls, which is toxic to many garden plants including tomatoes, peppers, apples, and blueberries; maintain a 50–80 foot buffer from sensitive plants. Trees are monoecious and partially self-fertile but cross well with a second tree. Hulls stain skin and clothing an indelible dark brown; wear gloves when husking. Nuts are ready when hulls are yellow-green to black and dent when pressed; cure for 2–3 weeks after husking.
Source and local conditions
Typical planning ranges from OpenPlantDB (CC0). Cultivar, climate, season and growing method can change these values. Confirm the seed label and local guidance before planting.
Source & verification
OpenPlantDB · CC0