Quercus dentata 'Sir Harold Hillier'

RHS Plant Profile
Daimyo oak 'Sir Harold Hillier'
Daimyo oak 'Sir Harold Hillier' RHS
Trees

A slow growing, deciduous tree to 10m tall, with stout shoots and a rounded crown on maturity. Leaves are very large, glossy, and shallowly lobed, and turn deep orange to pink in autumn. Small greenish-yellow catkins are produced in spring, followed by near-spherical single acorns

Position

Full sun, Partial shade

Soil Types

Clay, Loam, Sand

Max Height

8-12 metres

Max Spread

4-8 metres

Size

Time to Maturity
20–50 years
Max Spread
4-8 metres
Max Height
8-12 metres

Growing Conditions

Clay Loam Sand
Moisture
Moist but well–drained
pH
Acid or Neutral

Position

Full sun Partial shade
Aspect
East–facing or North–facing or South–facing or West–facing
Exposure
Exposed or Sheltered
Hardiness
H5

Colour & Scent

Season Stem Flower Foliage Fruit
Spring
Summer
Autumn
Winter

Botanical Details

Family
Fagaceae
Native to GB/Ireland
No
Foliage
Deciduous
Habit
Spreading branched
Potentially harmful
Pets (dogs): Harmful if eaten - for further information and contact numbers regarding pets, see the HTA guide to potentially harmful plants
Genus
Quercus can be deciduous or evergreen trees or shrubs, with entire, lobed or toothed leaves; flowers inconspicuous, followed by characteristic acorns; sometimes good autumn colour
Name Status
Accepted

How to Grow

Cultivation

Grow in deep, fertile, well-drained neutral to acidic soil

Propagation

Propagate by grafting

Suggested planting locations and garden types

  • Architectural
  • Low Maintenance

Pruning

Pruning group 1

Pests

May be susceptible to aphids, oak slugworm, oak gall wasp and oak processionary moth

Diseases

May be susceptible to powdery mildews and honey fungus