Black Walnut
Juglans nigra
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Description
Black Walnut (Juglans nigra) is a large deciduous tree native to eastern North America, reaching heights of up to 30 meters. It plays a crucial role in agroecology and regenerative agriculture as a keystone species, contributing to ecosystem diversity and soil health through its leaf litter, which enriches the soil with organic matter. The tree's deep root system helps in preventing soil erosion and improving soil structure. Black Walnut is known for producing juglone, a natural compound that can inhibit the growth of certain plants, thus requiring careful planning in companion planting. In a food forest, it serves as an overstory layer, providing nuts that are a valuable food source for both humans and wildlife. Historically, Black Walnut has been used by Indigenous peoples for its nuts and wood, and it continues to be valued for its high-quality timber and edible nuts.
Growing Details
Black Walnut trees thrive in deep, well-drained loamy soils with a pH of 6.0 to 7.5. Prior to planting, enrich the soil with organic compost and ensure good drainage. Mulching with wood chips or leaf litter helps retain moisture and suppress weeds. Companion plants such as comfrey and elderberry can be grown nearby to enhance soil fertility and attract beneficial insects. Avoid planting sensitive species like tomatoes and apples nearby due to juglone sensitivity. Harvest nuts in late autumn when
Edible Parts
Fruit
Seed
Oil
Tags
Keystone Specie
Carbon Farming
Attracts Wildlife
Fire Wood
Building Wood
Windbreak
Erosion Preventing
Visual Appeal
High Protein
Oil
Colouring
Range (Based on GBIF Data)
The map shows known occurrence points of <strong>Juglans nigra</strong> recorded in scientific biodiversity databases.
Source: <a href="https://www.gbif.org" target="_blank">GBIF.org</a> โ Global Biodiversity Information Facility
Location & Timing
native geo location: Native to eastern North America
applicable geo region: North America
language used: en
Flowering:
middle
of May for 30 days
Harvest:
middle
of September for 60 days
Seed Start:
?
Indoor Start:
Transplant:
Uses & Benefits
Edible Rating:
(4/5)
edible uses: The nuts of the Black Walnut are highly nutritious, rich in protein and healthy fats. They can be consumed raw or roasted, and are commonly used in baking, confections, and as a flavoring agent in various dishes. The oil extracted from the nuts is also edible and used in culinary applications.
Medicinal Rating:
(3/5)
medicinal uses: Black Walnut has been used in traditional medicine for its antifungal and antimicrobial properties. The hulls are often used in herbal remedies to treat skin conditions such as eczema and ringworm, and as a natural remedy for intestinal parasites. Caution is advised as the hulls can be toxic if consumed in large quantities.
health concerns: Juglone produced by Black Walnut can be toxic to certain plants and may cause allergic reactions in sensitive individuals. It is advisable to handle the nuts and hulls with gloves to avoid skin irritation.
other uses: The wood of Black Walnut is highly valued for furniture and cabinetry due to its strength, durability, and aesthetic appeal. The husks can be used to produce a natural dye, and the tree's presence in landscapes can enhance biodiversity.
Scientific Literature
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Botanical data
specie: Juglans nigra
common names: Black Walnut; Eastern Black Walnut; American
family: Juglandaceae
sub family:
tribe:
sub tribe:
genus: Juglans
Growing Conditions
area needed: 30.0 m
spacing: 10.0 m
growing difficulty: High
Deciduous / Evergreen: Evergreen
Seed Temp (Opt/Min/Max): 21ยฐC / 15ยฐC / 25ยฐC
Plant Temp (Opt/Min/Max): 20ยฐC / -30ยฐC / 35ยฐC
water demands: Medium
humidity:
light demands: High
root type: Deep
frost tender: Low
hardness:
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(5/10)
first harvest: 10 years
life span: 200 years
succession: Late
growth rate: Medium
max height: 30.0 m
max width: 15.0 m
soil preference:
Medium (Loam)
pH preference:
Neutral
flower type:
Monoecious
growth details: Black Walnut trees thrive in deep, well-drained loamy soils with a pH of 6.0 to 7.5. Prior to planting, enrich the soil with organic compost and ensure good drainage. Mulching with wood chips or leaf litter helps retain moisture and suppress weeds. Companion plants such as comfrey and elderberry can be grown nearby to enhance soil fertility and attract beneficial insects. Avoid planting sensitive species like tomatoes and apples nearby due to juglone sensitivity. Harvest nuts in late autumn when
Potential Disturbances: Natural pest management for Black Walnut includes encouraging beneficial insects such as lacewings and ladybugs to control aphids. Parasitic wasps can help manage walnut caterpillars. Planting garlic or marigolds nearby can deter pests like the walnut husk fly. Neem oil and garlic sprays are effective organic solutions for pest control.
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