California Black Walnut (Juglans californica)

California Black Walnut

Also known as: Southern California Black Walnut, Walnut

The california Black Walnut (*Juglans californica*) grows naturally only in southern California, though it is cultivated elsewhere as well. It can grow in the form of a tree or shrub. Oftentimes it is cultivated for its rootstock, onto which English Walnut trees can be grafted. It is also becoming a popular ornamental tree, especially in landscaping and natural landscaping circles.

Scientific classification

Species

California Black Walnut (Juglans californica)

Beeches, walnuts, and allied trees

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Perennial

Lifespan

10 m

Spread

Green

Leaf Color

5 cm to 8 cm

Flower Size

Green, Yellow

Flower Color

Evergreen, Deciduous

Leaf type

15 - 35 ℃

Ideal Temperature

Images of California Black Walnut

Distribution of California Black Walnut

Distribution Map

California Black Walnut is indigenous to the Southwest region of North America. Its presence extends to various terrains within this major region, thriving particularly in riparian zones. California Black Walnut has also been introduced beyond its native range to regions with compatible climates, albeit in a limited manner. While specific introduced locations are not detailed here, california Black Walnut's adaptability to new environments is acknowledged.

Native

Cultivated

Invasive

Introduced

No species reported

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Habitat

Streambanks, hills, valleys

Hemisphere Trend Curve

Northern

Sorthern

Culture

Symbolism

Health, Mental powers, Infertility

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Care Guide for California Black Walnut

Every 2-3 weeks

Water

Full sun

Sunlight

15 - 35 ℃

Ideal Temperature

Water: California Black Walnut is drought-tolerant, requiring watering every 2-3 weeks, and thrives in outdoor settings to take advantage of natural rainfall. Its water needs are linked to seasonal leaf shedding, decreasing during dormancy.

Fertilize: California Black Walnut requires balanced nutrition fertilizers in spring and high nitrogen fertilizers in mid-summer for optimal growth. Fertilize with a balanced 10-10-10 NPK mix once in spring and use high-nitrogen formulas for younger trees. Avoid over-fertilization by following label instructions.

Pruning: California Black Walnut requires minimal pruning, mainly in spring for dead, diseased, damaged, or crossing branches. Use sharp, sterilized tools and cut just above a bud or branch to maintain its attractive branching structure.

Propagation: California Black Walnut is a California native tree valued for its hardwood and edible nuts. Propagate using fresh, stratified seeds planted in well-draining soil with consistent moisture. Seedlings need ample sunlight but may benefit from partial shade during early growth.

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