California black oak (Quercus kelloggii)

California black oak

Also known as: Kellogg oak

The acorns of california black oak (Quercus kelloggii) were considered the best food acorns by Native Americans. Acorns are bigger than those of other species, measuring from 2.5 to 3 cm long to 1.5 to 1.8 cm wide. It’s native to western North America. If the soil is well-drained, it can grow in many different types of soil.

Scientific classification

Species

California black oak (Quercus kelloggii)

Beeches, walnuts, and allied trees

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Toxic to Humans

Toxicity

Perennial

Lifespan

Tree

Plant Type

Spring, Early summer

Bloom Time

Early fall, Mid fall

Harvest Time

9 m to 25 m

Plant Height

10 m

Spread

Green, Yellow, Orange

Leaf Color

Brown

Fruit Color

15 - 38 ℃

Ideal Temperature

Spring, Summer

Growth Season

Slow

Growth Rate

Images of California black oak

Attributes of California black oak

Growth Rate

In california black oak's active growth seasons of spring and summer, its slow growth rate results in a steady, gradual expansion of its broad, deep-green deciduous canopy. This ensures its adequate use of available resources, prioritizing resilience over rapid expansion. Notably, late spring spurs prolific acorn production, decidedly influenced by its leisurely growth speed.

Distribution of California black oak

Distribution Map

California black oak is a plant native to western North America, particularly thriving in Mediterranean-climate regions. It has been introduced and cultivated in various temperate zones globally, extending its presence beyond its native range. The species prefers mountainous and coastal terrains within its endemic area, and due to its adaptability, it manages to thrive when deliberately cultivated in similar climates around the world.

Native

Cultivated

Invasive

Introduced

No species reported

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Habitat

Coniferous forests

Hemisphere Trend Curve

Northern

Sorthern

Culture

Symbolism

Protection, Health, Money

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Toxicity

California black oak can cause mild or moderate toxicity if ingested, including symptoms like upset stomach and bloody stool. The toxic parts are the young leaves and acorns. Cats and dogs can also be affected by consuming large amounts, showing signs of gastrointestinal upset and weakness. Immediate veterinary care is crucial if poisoning is suspected.

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Care Guide for California black oak

Every week

Water

Full sun

Sunlight

15 - 38 ℃

Ideal Temperature

Water: California black oak prefers moderate hydration and thrives with weekly watering. As an outdoor deciduous tree, it shows significant water uptake during the growing season, essential for maintaining lush foliage and strong growth. This species is resilient against occasional dry spells typical of its native woodland habitat.

Fertilize: California black oak requires balanced nutrition fertilizer in spring and high-nitrogen formulas in early summer for optimal growth. Apply quarterly, using 1-2 pounds per inch of trunk diameter, while avoiding over-fertilization to protect roots and soil health. Adjustments are necessary for active growth and dormant phases.

Pruning: California black oak is a robust deciduous tree with deeply lobed leaves and rugged bark. Prune in early spring, focusing on dead branches and thinning for sunlight. Regular pruning promotes health and structural integrity. Use clean, sharp tools to minimize damage and encourage healing.

Propagation: California black oak can be propagated through hardwood cuttings, air layering, and sowing seeds in autumn and winter. With moderate difficulty, successful propagation is indicated by new growth. Utilizing hormone rooting powders and maintaining moisture enhances the chances of success.

Repotting: Repot california black oak every 2-3 years in late winter to minimize growth disruption. Use a spacious container and well-draining soil. Post-repotting, ensure adequate water and monitor carefully as california black oak is sensitive but can thrive with consistent care.

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Images of California black oak

Attributes of California black oak

Distribution of California black oak

Culture

Toxicity

Care Guide for California black oak

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