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Black Walnut 'Black Gem'

Juglans nigra

Family: Juglandaceae (joo-glan-DAY-see-ee) (Info)
Genus: Juglans (JOO-glanz) (Info)
Species: nigra (NY-gruh) (Info)
Cultivar: Black Gem
Additional cultivar information:(aka Stark Black Gem)


Edible Fruits and Nuts


Foliage Color:

Unknown - Tell us

Bloom Characteristics:

Unknown - Tell us

Water Requirements:

Average Water Needs; Water regularly; do not overwater

Where to Grow:

Unknown - Tell us


over 40 ft. (12 m)


over 40 ft. (12 m)


USDA Zone 4a: to -34.4 C (-30 F)

USDA Zone 4b: to -31.6 C (-25 F)

USDA Zone 5a: to -28.8 C (-20 F)

USDA Zone 5b: to -26.1 C (-15 F)

USDA Zone 6a: to -23.3 C (-10 F)

USDA Zone 6b: to -20.5 C (-5 F)

USDA Zone 7a: to -17.7 C (0 F)

USDA Zone 7b: to -14.9 C (5 F)

USDA Zone 8a: to -12.2 C (10 F)

USDA Zone 8b: to -9.4 C (15 F)

USDA Zone 9a: to -6.6 C (20 F)

USDA Zone 9b: to -3.8 C (25 F)

Sun Exposure:

Full Sun


Parts of plant are poisonous if ingested

Handling plant may cause skin irritation or allergic reaction

Bloom Color:

Chartreuse (Yellow-Green)

Bloom Time:

Late Spring/Early Summer




Other details:

Unknown - Tell us

Soil pH requirements:

6.1 to 6.5 (mildly acidic)

Patent Information:

Unknown - Tell us

Propagation Methods:

From seed; direct sow outdoors in fall

Seed Collecting:

Remove fleshy coating on seeds before storing

Wear gloves to protect hands when handling seeds


This plant has been said to grow in the following regions:


Florala, Alabama

Paxton, Florida

Saint Paul, Minnesota

Kinston, North Carolina

Burbank, Washington

show all

Gardeners' Notes:

No details have been posted.