Sessile oak (Quercus petraea)

Sessile oak

Also known as: Durmast oak, Chestnut oak

Native to Europe and common across the British Isles, the sessile oak (Quercus petraea) is the national tree of Ireland. Its name means "stemless," in reference to its small green acorns that grow directly on the branches. Sessile oak feeds and nourishes dozens of animals but is a particular favorite for the caterpillars of purple hairstreak butterflies.

Scientific classification

Species

Sessile oak (Quercus petraea)

Beeches, walnuts, and allied trees

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Perennial

Lifespan

Tree

Plant Type

Spring, Early summer

Bloom Time

Fall

Harvest Time

20 m to 40 m

Plant Height

25 m

Spread

Green, Orange, Brown

Leaf Color

5 cm to 8 cm

Flower Size

Brown, Copper

Fruit Color

Yellow, Green

Flower Color

Green, Brown

Stem Color

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Toxicity

Sessile oak poses mild toxicity to both cats and dogs. The entire plant is harmful if ingested. Cats may show general discomfort, while dogs might experience gastrointestinal upset or lethargy. Immediate veterinary care is crucial in cases of suspected ingestion to ensure the safety and health of the pets.

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Quickly Identify Sessile oak

Broad, rounded crown with a dense canopy.

Acorns grow stalkless in clusters.

Leaves with glossy upper surface, pubescent underside, and rounded lobes.

Grey-brown stem with tawny lenticels, thickening towards base.

Deeply fissured, rugged bark ranging from light to dark gray.

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Care Guide for Sessile oak

Every 2 weeks

Water

Full sun

Sunlight

5 - 32 ℃

Ideal Temperature

Garden Soil

Soil Type

Water: Sessile oak thrives in temperate climates, managing moderate moisture levels and tolerating dryness. Regular watering every two weeks is sufficient. As an outdoor plant, mulching is beneficial for moisture retention, simulating natural leaf litter found in its habitat.

Fertilize: For sessile oak, use balanced fertilizers in spring and high nitrogen ones in late winter, applying twice yearly at bud-break and midsummer. Avoid over-fertilization to prevent root burn. Adjust applications as dormancy nears, incorporating into topsoil around the tree's drip line for best results.

Pruning: Sessile oak features lobed leaves and a sturdy structure, requiring early spring pruning to reduce sap loss and boost growth. Remove dead branches for shape and air circulation, and thin the canopy for light. Use clean, sharp tools to avoid damage and pathogen spread.

Propagation: Sessile oak is propagated by sowing healthy acorns collected from trees. They require cold stratification to break dormancy. Plant in well-drained soil, with the acorn just below the surface. With proper care, watering, and protection, they develop into strong saplings.

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Images of Sessile oak

Toxicity

Quickly Identify Sessile oak

Care Guide for Sessile oak

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