Oak Summit Nursery
Black Walnut Seeds
Black Walnut Seeds
Pack contains: 10 walnuts
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Black Walnut (Juglans nigra) seed was collected from mature Manitoba trees selected for cold hardiness and nut production under prairie conditions. Unlike seed brought in from warmer provinces, this source has already been exposed to the colder winters of southern Manitoba.
The edible nuts mature inside round green husks about the size of an orange and usually drop in early October. Mature trees have a straight trunk, an open rounded crown, and compound leaves up to 24 inches long. Black Walnut roots produce juglone, although its effect on nearby plants is often less severe than commonly assumed.
Walnuts can have deep dormancy. Some nuts germinate promptly in spring, while others need more time and may continue germinating into late summer.
Cold Hardiness Zone: 3
Seed Source: Manitoba
Stratification Required: 4 months cold
Mature Size: 80 to 90 ft
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Growing details
- Hardiness reference
- USDA zones 4a-9b
- Native range
- Eastern United States into southeastern Canada; Canadian occurrences include Manitoba, Ontario and Quebec
- Growing site
- Full sun to partial shade; well-drained clay, loam or sand; acidic to neutral pH; broad moisture tolerance
- Kernel flavour
- Sweet nutmeat
- Pollination
- Wind-pollinated with male and female flowers on each tree; the source does not establish whether a second genotype is needed for best cropping
Cold hardinessZone 3 · Canadian maps for this plant
Zone 3 and warmer
The map shows minimum winter hardiness. Soil, moisture and summer warmth also affect how a plant grows.
About these maps
Climate: Natural Resources Canada, 1991–2020. Provincial distribution: VASCAN via retained botanical research. Province outlines: Natural Earth, public domain.
Open Government Licence – Canada