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Acer palmatum 'Ō-kagami' (P)

Japanese maple 'O-kagami'

A small, upright tree eventually reaching about 5m in height, with 5-7 lobed leaves to 11cm long, purplish wine-red when young then maturing to shiny. blackish-red before taking on green tints later in summer. Red and scarlet autumn colours follow. Inconspicuous red-purple flowers in spring may be followed by winged, purple fruits

Synonyms
Acer palmatum var. dissectum 'Okagami'
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Size
Ultimate height
4–8 metres
Time to ultimate height
10–20 years
Ultimate spread
2.5–4 metres
Growing conditions
Clay
Loam
Sand
Moisture
Moist but well–drained
pH
Acid, Alkaline, Neutral
Colour & scent
StemFlowerFoliageFruit
Spring Purple Red Purple Red
Summer Purple Red Green Purple
Autumn Red
Winter
Position
  • Full sun
  • Partial shade
Aspect

East–facing or North–facing or West–facing

Exposure
Sheltered
Hardiness
H6
Botanical details
Family
Sapindaceae
Native to the UK
No
Foliage
Deciduous
Habit
Bushy, Spreading branched
Genus

Acer can be deciduous trees or large shrubs with paired, often palmately-lobed leaves and small flowers followed by characteristic winged fruits. Many have fine autumn colour, and some have ornamental stems

Name status

Accepted

How to grow

Cultivation

Grow in any moisture-retentive, well-drained soil in a sheltered position. Leaf colour is best in partial shade, although full sun can be tolerated if soil is reliably moist. Leaf scorch can be caused by lack of soil moisture or excessive exposure. Suits container cultivation but attention to watering is needed in dry spells during the growing season. See Japanese maples cultivation

Propagation

Propagate by layering in autumn, grafting in late winter or softwood cuttings

Suggested planting locations and garden types
  • City and courtyard gardens
  • Cottage and informal garden
  • Patio and container plants
Pruning

Pruning group 1 from late autumn to midwinter only

Pests

May be susceptible to Acer gall mite, aphids, caterpillars and horse chestnut scale

Diseases

May be susceptible to Verticillium wilt, acer leaf scorch and honey fungus

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