Blue oak (Quercus douglasii)

Blue oak

Also known as: Mountain oak

Also known as the blue oak, Quercus douglasii is only found in California and is the state's most drought-tolerant deciduous oak. This slow-growing, medium-sized tree can generally grow 6 to 20 m tall. Its leaves have a subtle bluish cast that gives the oak its common name and produces acorns with a somewhat sweet kernel.

Scientific classification

Species

Blue oak (Quercus douglasii)

Beeches, walnuts, and allied trees

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Toxic to Humans

Toxicity

Perennial

Lifespan

Tree

Plant Type

Spring

Bloom Time

6 m to 20 m

Plant Height

12 m to 15 m

Spread

Green, Blue

Leaf Color

Yellow, Green

Flower Color

Winter dormancy

Dormancy

Slow

Growth Rate

Images of Blue oak

Attributes of Blue oak

Growth Rate

Exhibiting a slow but steady growth profile during the Spring season, blue oak demonstrates a careful accentuation in its features. Height advancement incrementally rolls out during these months, aligned with the enduringly paced growth rate, enhancing the overall structural integrity of blue oak. The Spring-driven leaf production, while comparably unhurried, contributes to the plant's rugged resilience. Unusual yet fascinating, blue oak keeps a low yet expansive profile in non-Spring, cooler seasons, intriguing horticulture enthusiasts due to its seasonal duality.

Culture

Symbolism

Protection, Health, Money

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Toxicity

Blue oak has mild toxicity affecting cats and dogs if leaves and seeds are consumed in large quantities, causing symptoms like vomiting, diarrhea, and lethargy. Immediate veterinary care is essential to mitigate adverse effects and improve outcomes. Ensure pets do not ingest significant amounts of blue oak to prevent poisoning. Prompt attention is crucial for the animals' health.

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Care Guide for Blue oak

Every 3 weeks

Water

Full sun

Sunlight

15 - 38 ℃

Ideal Temperature

Water: Blue oak thrives in dry environments, showcasing high drought tolerance and effective moisture conservation. Watering should occur approximately every three weeks. While often an outdoor plant benefiting from natural rainfall, supplemental watering may be necessary in non-native climates during extended dry spells.

Fertilize: For optimal growth, blue oak requires balanced nutrition fertilizers, applied annually in spring based on size and soil fertility. Use slow-release formulas and test soil before fertilizing. Adjust fertilization according to seasonal growth stages, with dormant blue oak needing minimal nutrients to avoid harm.

Pruning: Blue oak is a drought-tolerant tree with blue-green leaves and a twisted habit. Prune in early spring, focusing on dead or crossing branches for better air circulation. Light, regular pruning maintains shape and health, reduces limb breakage risk, and promotes vitality.

Propagation: Blue oak can be propagated through hardwood cuttings, air layering, or seeds in autumn or winter. Propagation success is indicated by rooting cuttings or seed germination. Key tips include selecting healthy parent plants and employing proper planting and watering techniques.

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Images of Blue oak

Attributes of Blue oak

Culture

Toxicity

Care Guide for Blue oak

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