Japanese blue oak
Also known as: ring-cupped oak
A medium-sized, evergreen tree or, more often, a large, bushy shrub. The thick, leathery foliage is dark green above, blue green below, and may have bronze or purple tones when young. Inconspicuous catkins in spring are followed by 2cm-long acorns
Scientific classification
- Species
- Japanese blue oak (Quercus glauca)
- Genus
- Quercus
- Family
- Fagaceae
- Information to be completed
- Toxicity
- Trees
- Plant type
- 8-12 metres
- Height
- 4-8 metres
- Spread
- Evergreen
- Foliage
- Bushy
- Habit
- Spring · Summer · Autumn · Winter
- Season of interest
- Full sun
- Sunlight
- Information to be completed
- Ideal temperature
Japanese blue oak pictures
Distribution of Japanese blue oak
Distribution map
Japan, China
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Culture
Information to be completed
Toxicity
Information to be completed
Quick identification of Japanese blue oak
Information to be completed
Japanese blue oak care guide
- Deep watering during dry spells, allowing slight surface drying between soakings
- Watering
- Full sun
- Sunlight
- Information to be completed
- Ideal temperature
Watering
Deep watering during dry spells, allowing slight surface drying between soakings
Fertilizing
FertilizingBalanced shrub or tree feed once each early spring
Pruning
PruningLittle pruning is needed. Remove diseased, damaged, crowded or crossing shoots and unwanted growth. Timing depends on the plant: generally late winter or early spring; plants prone to bleeding and deciduous magnolias need different timing, and deciduous azaleas and lilacs are pruned after flowering.
Propagation
PropagationPropagate by seed sown in a coldframe or seedbed as soon as ripe or by grafting in mid-autumn or late winter
Growing
GrowingGrow in deep, fertile, well-drained soil in full sun, with shelter from cold winds and late frosts
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Common pests and diseases
Diseases
May be susceptible to powdery mildews and honey fungus
Pests
May be susceptible to oak processionary moth, aphids, caterpillars, leaf-mining moths and oak gall wasps
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