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QUERCUS x bushii 'Seattle Trident'
Commonly known as Oak
A magnificent foliage plant with pinkish new growth and glossy dark green leaves.
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DeciduousVery large, trident-shaped leaves to 20cm (8in) long
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Height12m (39ft)
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Spread10m (33ft)
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TreeMedium-fast growing, branching tree. Prominently 3-lobed leaves turn bronze in autumn and are slow to fall
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Very hardyHardy in the severest continental climates including exposed upland locations in the UK. Plant can withstand temperatures < -20 (-4°F)
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Full sun
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Partial shadeLight, dappled shade
QUERCUS x bushii 'Seattle Trident'
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Additional FeaturesGood to knowA selected hybrid of Q. marilandica and Q. velutina. Raised from seed in 1937. Scions sent to Hilliers, UK, in 1962Pests & DiseasesAphids, gall wasps, oak wilt, honey fungus, powdery mildewPlace of originGarden origin. USA. Washington Park Arboretum, Seattle
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Garden Location/ConditionsWoodland garden
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HardinessFully hardy
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Leaf marginLobed
(see photos above) -
Pruning groupPruning group 1Suitable for: Deciduous and evergreen trees, and some deciduous shrubs.
Pruning: Minimal pruning required. Prune wayward or crossing branches to maintain a healthy framework.
When: When dormant in the late winter/early spring. Some in the summer/autumn to prevent bleeding of sap.
RHS group 1 -
Seasonal InterestAutumnSpring
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Soil ConditionsNeutral to acid soil
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Toxic - Category CHarmful if eaten(Can be harmful to pets if eaten)
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Tree ShapeRounded to broadly spreading
12m (39ft)
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10m (33ft) |
Useful extras...

Fertilisers & Feeds - Vitax
Q4 Pelleted Fertiliser
A useful fertiliser suitable for use on a wide variety of plants. Q4 provides all the nutrients and trace elements essential for vigorous growth, abundant flowering and ripening of fruit.
3 options from £6.00

Fertilisers & Feeds - Empathy
Rootgrow mycorrhizal fungi
Recommended by the RHS. Contains Rootgrow™ mycorrhizal fungi. Suitable for all trees and shrubs (except rhododendrons, azaleas, heathers, cranberries and blueberries)
2 options from £6.00

Vermin & Pest Control
Tree Guards
Essential small tree protection from vermin and strimming. This pack includes 5 x 90cm canes and 5 x 90cm spiral guards. Includes instructions.
Only £5.00

Garden Goodies
Slate Plant Labels
These wonderfully tactile natural slate plant labels are hand made in Cornwall and come with a chalk pen.
Just stick them in your pot or border. Pack of 6.
Only £10.20

Garden Goodies
Slate Tie-on Plant Labels
Hand made in Cornwall, these delightful natural slate labels are perfect for pots.
Comes with chalk pen. Pack of 5
Only £10.20