Known to be toxic - Toxic to mammals if ingested.
Source: Adrian S Pye
Plant Names
Juglans nigra
Black Walnut
Noyer noir
Synonyms
American walnut
Plant Characteristics
Bloom Colour: Green
Bloom Period: May - Jun
Max Height: 100.0 feet
Max Width: 100.0 feet
Light Condition:
More than 6 hours of direct sun a day
Soil conditions:
Tolerates medium soil condition
More than 6 hours of direct sun a day
Tolerates medium soil condition
Lifespan:
Perennial
plants that will come back year after year
Gardener Experience:
Does not spread uncontrollably
Self-seeding
Does not spread uncontrollably
Self-seeding
Landscape Uses:
No landscape information available.
Ecological Benefits:
No ecological benefits information available.
Tolerates:
Tolerates limestone conditions
Tolerates acidic soil conditions
Tolerates juglone conditions
Tolerates limestone conditions
Tolerates acidic soil conditions
Tolerates juglone conditions
Special Features and Considerations:
This plant causes skin rashes
This plant causes skin rashes
Seed and plant distribution status
No seeds available for this plant.
We currently accept seeds for this plant
Fun Facts
Black Walnut is a significantly sized tree, suitable for rural and large suburban lots. With attractive dark bark and a wide crown, its branches start quite high off the ground. Black Walnut produces juglone, a chemical that is toxic to some other plants.
Plant Location
Distribution according to VASCAN
Ephemeral
Native
Introduced
Excluded
Extirpated
Doubtful
Absent
Canadensis
Thrives in Ecozones
- Mixed Wood Plains
Ecological Benefits
Butterflies Supported by Juglans nigra
-
Polygonia faunus
Green Comma - Polygone à Taches Vertes -
Prochoerodes lineola
Large Maple Spanworm -
Satyrium calanus
Banded Hairstreak - Porte-queue du Chêne
Specialized Bees Supported by Juglans nigra
No bee data available for this plant.
Complementary Plants
- No complementary plants found.
Substitute For Non-Native Plants
- Rhamnus cathartica (Common Buckthorn)
- Rhamnus frangula (Glossy Buckthorn)
- Acer japonicum (Japanese Maple)
- Acer platanoides (Norway Maple)
- Juglans nigra (Black Walnut Cultivar)
Sowing Information
Download Seed Envelope Labels (PDF)
- Sowing depth: Sow 1 inch deep
- Sow anytime
- Stratification duration: 0 days
- Self-seeding
- Notes: Soak for 24h.
Harvesting and Seed Sharing
- Harvest start month: September
- Harvesting indicator:
- Pods are released from plant
- Harvesting:
- Nut has been released from tree
- Seed viability test:
- Put seed in container filled with water
- If the seed goes at the bottom of the container, you can donate
- If seed floats, do not donate
- Packaging measure: Six (6) seeds (eyeball)
- Seed storage:
- Air dry in paper bag or open container, for a few days until crisp
- Shake seeds to move them once in a while to prevent molding
- Cultivar: Yes, do not donate unless you know source, and there are no known cultivars in your garden or at proximity
- No harvesting video available at this time.
Toxicity Notes
Toxic to mammals if ingested.